What causes a blower motor to stop working?

Table of Contents

What causes a blower motor to stop working?

In a situation where the motor doesn’t work on any speed, the most likely causes are: a blown power supply fuse, a bad motor ground connection, bad motor speed control module or a failed motor. On all systems, a failed blower motor is least likely. Blower motors generally don’t fail out of the clear blue.

What to do if your blower fan is not working?

Blower Motor Resistor Replacement – YouTube Blower fan not working – 2004-2014 Ford F-150 and other models. Blower Motor Resistor Replacement If playback doesn’t begin shortly, try restarting your device.

How can I tell if my blower motor resistor is faulty?

Another symptom of a faulty blower motor resistor is no air from the vehicle’s vents at all. Power to the blower motor is fed through the blower motor resistor, so if it fails or has any issues power can be cut off to the motor.

How is the speed of the blower motor controlled?

The electronic module that controls the speed of the blower motor is called a blower motor control module. In some cars, the blower motor has only 4 or 5 fixed speeds. In this case, the speed of the blower motor is controlled by a blower motor resistor.

Why is my AC blower not working?

A common problem behind an air conditioner blower not starting includes overheating, which keeps the motor from running. Let your air conditioner rest and cool down for a while before trying to turn it on again; if the motor works at that point, overheating is probably the problem.

What are the symptoms of blower motor failure?

  • Lack of air from the vehicle’s vents
  • Stuck on specific settings
  • Stuck at one speed

    Is my blower motor bad?

    No air from the vents. No air flow from the vents when the heater or air conditioning is activated is another symptom of a bad blower motor. If the heater blower motor burns out or short circuits, it will not function, and therefore will not be able to produce any airflow for the system. The blower motor will usually have to be replaced in order…

    Why does blower motor resistor keep going out?

    The blower motor appears to be defective here. When the brushes wear out the motor draws excessive amps which could cause the resistor to burn out. Before making further replacements remove the motor and check it, especially the brush assembly. This is the most likely reason for the resistor to fail repetitively.

    Why is the resistor not working on my blower?

    Hi There, The resistor is what controls the speed of the blower motor, not the relay. The blower motor relay supplies power to this motor when you turn the switch to “on” that can sometimes fail. When this happens, you may notice that you will not feel anything blowing out of the vents at all.

    How does a high speed blower motor work?

    In the highest fan speed state, the blower resistor is bypassed completely and the fan is effectively connected directly to the car’s battery, allowing maximum current to be supplied to the blower motor.

    What causes a car starter to not engage?

    5 Causes of Starter is Not Engaging 1 Low Battery Voltage 2 Faulty starter motor solenoid 3 Starter motor Plunger or Pinion 4 Faulty Wiring to starter 5 Flywheel damages More …

    What does it mean when a blower motor does not turn?

    Changes in voltage indicate that the resistor is working and that the switch is able to vary the speed of the blower. If there is voltage but the motor doesn’t turn, disconnect the plug and connect one of the motor’s terminals to a good ground and the other to a 12-volt fused source. The motor should spin at its highest setting.

    What should I do if my blower wont shut off?

    If the blower stops with either of these steps, the problem is in the HVAC control module. However, if the blower continues to run at high speed with either of those tests, replace the blower motor control processor. Just as an FYI, the retail price of the blower motor control processor is $280.34.

    Hi There, The resistor is what controls the speed of the blower motor, not the relay. The blower motor relay supplies power to this motor when you turn the switch to “on” that can sometimes fail. When this happens, you may notice that you will not feel anything blowing out of the vents at all.

    In the highest fan speed state, the blower resistor is bypassed completely and the fan is effectively connected directly to the car’s battery, allowing maximum current to be supplied to the blower motor.

    How do you fix a blower motor on a car?

    Disconnect the electrical connector at the blower motor and jumper power and ground to the motor, bypassing all the speeds controls. Run a fused jumper from the battery to the power side of the motor and connect a temporary grounding jumper to the other motor terminal.

    How does the HVAC control head work on a blower?

    In those applications, the HVAC control head is a digitally controlled unit and uses various sensor inputs to determine when to supply heat. Based on the driver’s input to the blower speed switch, the HVAC control head sends a digital signal to the blower motor speed control module.

    Why does my blower motor make a squealing noise?

    The squealing noise happens most often in the winter during cold startups and may disappear as the motor heats up. If you ignore the noise, the bearing will continue to wear to the point where the motor won’t start at all. The reason I’m not including the motor resistor as a suspect is because it usually only controls the lower speeds.

    Why is my GMC Savana 3500 heater not working?

    While there are a variety of reasons your GMC Savana 3500 heater is not working, the most common 3 are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor.

    In a situation where the motor doesn’t work on any speed, the most likely causes are: a blown power supply fuse, a bad motor ground connection, bad motor speed control module or a failed motor. On all systems, a failed blower motor is least likely. Blower motors generally don’t fail out of the clear blue.

    How to fix a Chevy Express heat fan blower?

    – Resistor Replacement, Wire Harness Repair – YouTube Chevy Express Van- Ac/Heat Fan Blower issue Fixed! – Resistor Replacement, Wire Harness Repair If playback doesn’t begin shortly, try restarting your device. Videos you watch may be added to the TV’s watch history and influence TV recommendations.

    What happens when the blower fails on a Chevy Equinox?

    When the blower motor fails, the air conditioner and heater may still work, and heat or cool may be felt at the vents, but the air pressure will be dramatically decreased. This Read More When the heater control valve fails, adjusting the temperature may not change the air temperature at the vents, whether hot or cold.

    Can a blower fan only work on high speed?

    Blower Motor Fan Only Works On High Speed? Plus – Tips To Prevent Repeat Failures! If playback doesn’t begin shortly, try restarting your device. Diagnostic training videos and content hosted by ASE Master and L1 Certified Technicians.

    Why does my furnace blower not come on?

    I have an older Maytag furnace that will fire up but the blower motor doesn’t come on, after a minute the the limit switches will turn of the furnace because it will get to hot. I already replaced the motor, the limit switches, and the motor board but I still have the same problem.

    How can I check if my blower motor is working?

    You turn the blower on by completing the circuit to ground. First check the fuse and all connections. Second, check to see if there is any power at the blower motor. Place two large straight pins in the plug of the blower motor but leave the blower motor plugged in. Place a voltmeter across the two pins.

    How can I tell if my blower motor is bad?

    There are a couple of tools out there [for testing motors], like the TECMate [from Genteq]. You plug it into the motor and hit a button, and it tells you if the motor is good or bad.” While recurring blower motor failure is uncommon, it does happen, and finding the root cause is required in order to prevent the motor from failing again.

    What kind of motor does a variable speed blower use?

    Variable speed blower motors don’t use a blower motor resistor. Instead they use a blower motor speed control or a power transistor. Variable speed motors are most often used in vehicles with automatic climate control.

    There are a couple of tools out there [for testing motors], like the TECMate [from Genteq]. You plug it into the motor and hit a button, and it tells you if the motor is good or bad.” While recurring blower motor failure is uncommon, it does happen, and finding the root cause is required in order to prevent the motor from failing again.

    How does the speed of a blower motor work?

    This means that the current running through the blower motor, and its’ speed is therefore controlled by the resistor value. The user chooses a fan speed by selecting a speed which then connects one of the resistors in the blower resistor pack.

    Why does my blower run for a while then dies?

    The fuel lines on your blower carry fuel from the tank to the engine. If these fuel lines are obstructed, it can’t allow the proper amount of fuel to enter the engine, which will cause it to run for a short time, but ultimately stall out. You may be able to clean out the fuel lines and solve this problem.

    What causes a leaf blower to stall and stall?

    A clogged carburetor is most commonly caused by leaving fuel in the leaf blower for a long period of time. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and cause the engine to stall.

    What should I do if my leaf blower won’t work?

    It all depends on what problems your leaf blower is suffering from. At the end of the day, make sure that you keep your leaf blower clean, and in a safe place. Also, if you are not using it regularly, it is better to drain the fuel, rather than allowing it to evaporate. How do leaf blowers work?

    Why does my HVAC blower need to be replaced?

    The blower motor is the part of your HVAC system that uses the most energy, so it may very well be the culprit if you see a significant rise in your utility bills. An aging, problematic, or dirty motor has to work harder to properly circulate conditioned air throughout your home, which leads to higher energy consumption.

    Disconnect the electrical connector at the blower motor and jumper power and ground to the motor, bypassing all the speeds controls. Run a fused jumper from the battery to the power side of the motor and connect a temporary grounding jumper to the other motor terminal.

    What happens if you lose the blower motor relay?

    The blower motor is the component responsible for pushing air through the vents of your vehicle’s heating and air conditioning systems. Without it, the AC system will not be able to circulate any heated or cooled air. The blower motor relay controls the current used to power the blower motor,…

    What to do if your AC or heater is not blowing?

    If your Blower Motor for the AC or Heater suddenly stopped blowing, look here first, it might save you several dollars. Situation, we have a friend that owns a 2017 Chevy Trax LT, she is a nurse who works with my wife, single mom and on a single mom budget.

    Where is the blower resistor on a 2017 Chevy?

    Hit the A/C button, compressor is coming on, so not a low Freon issue. On the 2017, I located the blower resistor plugged into the duct on the passenger side, upper left area of the foot area, was surprised to find out that it could be accessed without even removing the cover for the blower area.

    Can a blower motor be pulled out of an AC unit?

    Pulled the blower motor out, it does not spin easy. But hooked to power. It blows like it should. Let it run for around a minute. Tomorrow will check and see how many amps it pulling. I turned the ac on with the blower motor out. Then turned on the sleeper blower. It ran that way, and AC compressor was staying locked in.

    What are the symptoms of a bad blower motor relay?

    3. Melted relay. Another more serious symptom of a problem with the blower motor relay is a burned or melted relay. Relays are exposed to high current loads and can sometimes get hot when they develop problems.

    Why is my furnace or AC blower not working?

    Furnace or AC Blower Motor Not Starting or Working! Top 10 Reasons Why! – YouTube If playback doesn’t begin shortly, try restarting your device.

    What to do if your AC blower is not working?

    Disconnect cables to motor and resistor. Remove hose from motor, it should just pull off with little effort. Unscrew motor and resistor. Screw new motor and resistor in. Connect hose to motor. Connect cables to motor and resistor. Turn on car and test AC. Thanks for watching! Loading…

    What’s the problem with my 1995 AC blower?

    1995 T600 ac blower kicks on, then like a relay kicks out. And it cuts back off. Wait 45 seconds to 60 seconds and kicks back on for a few seconds then back off again. Wondering if this could be the blower motor. Overloading the breaker/relay, then when it resets kick back on again? Not sure if these trucks have relays on the fan or not?

    3. Melted relay. Another more serious symptom of a problem with the blower motor relay is a burned or melted relay. Relays are exposed to high current loads and can sometimes get hot when they develop problems.

    How can I tell if my AC blower motor is broken?

    Air Conditioner Blower Motor Won’t Turn On. If you turn on your air conditioning system and find that there is no air blowing out of the AC unit, or no buzz of the blower fan motor, then it is possible the AC blower motor has an issue. This is one of the most common and easy ways to know if your air conditioner blower motor is broken or not.

    Can a Dodge Ram blower motor work on the AC?

    Dodge Ram blower motor won’t work on the heater and AC. There is no power going to the blower motor, fire reducer or to switch. Fuses are good, relays are good but it will not heat or cool the truck. How to fix this? Show More

    Where is the fuse on a blower motor?

    the blower motor fuse is inside the car on the driver side lower dash. There is a little panel you can remove. This circuit takes 2 15 amp fuses, i learned my lesson when i blew both and only replaced one, and wondered why i kept blowing that fuse. The fuses will be listed on that little panel you take off.

    How does a relay work on a blower motor?

    Finally, with the fan switch on the highest speed, the fan motor is receiving system voltage (14.5 with the engine running). Some systems will energize a relay when the switch is set at the highest fan speed. The relay then closes its contacts, feeding full voltage to the fan, because a relay can handle the current better than the fan switch.

    How does a half speed blower motor work?

    So a half speed driver request will result in the blower motor controller pulsing the ground connection off twice as often as when the fan is running at full speed. Carmakers use these three common wiring methods to supply power and ground to the blower motor in a manual system using a blower motor resistor.

    the blower motor fuse is inside the car on the driver side lower dash. There is a little panel you can remove. This circuit takes 2 15 amp fuses, i learned my lesson when i blew both and only replaced one, and wondered why i kept blowing that fuse. The fuses will be listed on that little panel you take off.

    Furnace or AC Blower Motor Not Starting or Working! Top 10 Reasons Why! – YouTube If playback doesn’t begin shortly, try restarting your device.

    How does a blower motor work in a car?

    Carmakers use these three common wiring methods to supply power and ground to the blower motor in a manual system using a blower motor resistor. In one design, the car maker supplies battery power to the speed switch, which switches the power to the appropriate connection on the blower motor resistor.

    How much does it cost to replace a blower motor?

    However, if the blower continues to run at high speed with either of those tests, replace the blower motor control processor. Just as an FYI, the retail price of the blower motor control processor is $280.34. There are a few places online that rebuild these puppies.

    When do you need to replace the blower motor relay?

    If the blower motor does not function, car fuses are blown, or relays are melting, you may have to replace the car blower motor relay. 1. Blower motor does not function 2. Blown fuses 3. Melted relay The blower motor relay is the electrical switch that is used to supply the power for the vehicle’s blower motor.

    Why does my car blower motor not shut off?

    If you have a vehicle with climate control system and a variable speed blower motor and the blower motor won’t shut off and stays on HIGH with the car turned off and the key out, chances are the blower motor motor control processor is toast or the HVAC control module is damaged.

    However, if the blower continues to run at high speed with either of those tests, replace the blower motor control processor. Just as an FYI, the retail price of the blower motor control processor is $280.34. There are a few places online that rebuild these puppies.

    If the blower motor does not function, car fuses are blown, or relays are melting, you may have to replace the car blower motor relay. 1. Blower motor does not function 2. Blown fuses 3. Melted relay The blower motor relay is the electrical switch that is used to supply the power for the vehicle’s blower motor.

    What causes a fuse to blow on a blower motor?

    If the blower motor relay develops any sort of problem that hinders its ability to properly limit and distribute power, it may cause the blower motor fuse to blow. Any sort of electrical spikes or excessive current from a bad relay will blow the fuse and cut power in order to protect the system.

    Can a blower motor be taken out of a corolla?

    This is typical behavior for the blower motor used in the Corolla. When you pull the blower motor, look at the armature, turn the motor so that you see the whole thing and you will see the problem. Unfortunately the blower motor can’t be taken apart to resurface the armature.

    Why is my car AC not blowing or car fan not working?

    It sounds like your blower motor or fan is damaged. The noise you heard was probably the fan blades hitting the side of your ventilation ducts and it suddenly stopped when either the motor failed or the fan finally got stuck. Replacing the blower motor and possibly fan should get you back to having AC!

    Why is my furnace blower not working?

    One of the most common problems with furnace fans is a bad blower relay . The first thing to do is check the relay or voltage from the board. If no voltage is recorded, you will have to replace the board or the relay. If there is a battery, check if it is working properly. This is another common reason behind faulty blower fans.

    What would cause the furnace blower not to turn on?

    1 – Low airflow Dirty Air Filters. If you don’t change your air filters often enough, the filters will become dirty and clogged, which means the heat exchanger retains heat and eventually causes it Dirty Blower Wheel. If your furnace goes on and off too quickly, it could be a dirty blower wheel. Closed or Blocked Air Supply Vents.

    What causes the AC blower not to come on?

    What to do if your central air blower won’t work?

    If the thermostat, breakers and access panel doors check out, the blower motor itself may have failed. Motors have a long useful life, but they do seize up or burn out in time. You may want to call a repair person at this point. A qualified air conditioning expert can test the motor, find the proper replacement and install it.

    Where is the fan blower motor on my AC?

    All fuses good all relays good. The fan blower for your ac/heater is located under the glovebox. Take your hand and smack the fan blower motor a few times. That’s all it took for for mine to start working again. It’s been working for over 6 month’s now!

    Air Conditioner Blower Motor Won’t Turn On. If you turn on your air conditioning system and find that there is no air blowing out of the AC unit, or no buzz of the blower fan motor, then it is possible the AC blower motor has an issue. This is one of the most common and easy ways to know if your air conditioner blower motor is broken or not.

    What happens when a central air blower does not start?

    The blower motor starts, turning fan blades that circulate cold air from the evaporator coils, through the home’s ductwork and into each room. If the blower motor fails to start, nothing happens. The living spaces gets uncomfortable as the cooling cycle stalls. Most thermostats control both central air and central heat.

    How does an air conditioner blower motor work?

    As explained in the HVAC Blower Motor Guide, an air conditioner blower motor and assembly is basically the fan inside the air conditioning system that forces the cooled air, via the AC cooling coil, through the vents and into the room space that is being conditioned.

    How do you troubleshoot a blower motor resistor?

    This can be annoying, but troubleshooting is easy. If you start at the blower motor, and check resistance in the circuit, you will find the problem in no time. Power supplied from the fuse panel passes through the switch to the blower resistor assembly.

    Why does my blower fan only work on one speed?

    by Lee Sallings. The most common symptom of a faulty blower motor resistor is a blower fan that only works on one speed, usually high. This can be annoying, but troubleshooting is easy. If you start at the blower motor, and check resistance in the circuit, you will find the problem in no time.

    What causes a bad or failing blower motor relay?

    Blown fuses. One of the first symptoms of a bad or failing AC blower motor relay is a blown AC blower motor relay circuit fuse. If the blower motor relay develops any sort of problem that hinders its ability to properly limit and distribute power, it may cause the blower motor fuse to blow. Any sort of electrical spikes or excessive current…

    Why does my a / C front blower stop working?

    No matter how many times (or position) the fan speed knob is moved, the front blower motor fails to respond. A/C system can be turned off and on multiple times, but the front blower fails to respond.

    What should I do if my blower motor is not working?

    If it’s good, refer to a wiring diagram for your vehicle and conduct these tests: Disconnect the electrical connector at the blower motor and jumper power and ground to the motor, bypassing all the speeds controls.

    Why is my blower fan not kicking on?

    When the resister of the blower motor starts to fail, the motor operates only intermittently. This often presents itself as the blower fan not kicking on until the engine is producing a certain level of electric current.

    Where does the ground go in a Honda blower motor?

    The blower motor control module (Honda calls it Power Transistor) supplies the ground. The power transistor has 4 wires: two come from the climate control system control unit, one is the ground, one goes to the negative terminal of the blower motor.

    What does it mean if your blower motor is not working?

    Average rating from 849 customers who received a AC is not working Inspection. The blower motor resistor is an electrical component that is a part of the vehicle’s heating and air conditioning system. It is responsible for controlling the blower motor’s fan speed.

    Another symptom of a faulty blower motor resistor is no air from the vehicle’s vents at all. Power to the blower motor is fed through the blower motor resistor, so if it fails or has any issues power can be cut off to the motor.

    What happens when a blower motor relay wears out?

    Without it, the AC system will not be able to circulate any heated or cooled air. The blower motor relay controls the current used to power the blower motor, and is subject to the constant on and off switching. Over time, it can eventually wear out.

    What does the blower motor resistor do in a car?

    The blower motor resistor is an electrical component that is a part of the vehicle’s heating and air conditioning system. It is responsible for controlling the blower motor’s fan speed. When fan speed is changed via the knob on the instrument cluster, the blower motor resistor changes setting, which changes the speed of the blower motor.

    How to get rid of the noise from the blower motor?

    Use the noise abatement knob in the center of the radio, turn it to the right… Don’t like the blower noise? Use the noise abatement knob in the center of the radio, turn it to the right… Click to expand… They got rid of that too in 2014 for most trim levels haha.

    Why is my AC not working in my Honda Civic?

    Did the air conditioning in your Honda Civic stop working all of a sudden? Check the relay before taking it to a mechanic! I have had the relay go out twice in my 2006 civic. If I didn’t know to check the relay first, a mechanic could have put me over a barrel, and sold me an entire new A/C system! Do not make that costly mistake! Loading…

    Did the air conditioning in your Honda Civic stop working all of a sudden? Check the relay before taking it to a mechanic! I have had the relay go out twice in my 2006 civic. If I didn’t know to check the relay first, a mechanic could have put me over a barrel, and sold me an entire new A/C system! Do not make that costly mistake! Loading…

    What to do if your Honda Civic has no power?

    Use the circuit tester and check for power at the 2-wire connector on the blower motor (the key and fan need to be on). If there is no power to the fan, the fan is bad. If there is no power, move to the blower motor resister right next to the blower motor.

    What are the symptoms of a bad blower motor resistor?

    No air from the vehicle’s vents. Another symptom of a faulty blower motor resistor is no air from the vehicle’s vents at all. Power to the blower motor is fed through the blower motor resistor, so if it fails or has any issues power can be cut off to the motor. A blower motor without power will not be able to produce any air pressure,…

    What should I do if my Honda AC Fan is not working?

    If there is no power to the fan, the fan is bad. If there is no power, move to the blower motor resister right next to the blower motor. It is usually to the left and slightly to the rear and is used to control the speeds of the fan. Check to see if there is power to the resister.

    Is the fuse on the blower motor okay?

    The blower motor fuse is fine (the one on the driver side shock tower, right?). This blower motor problem has been discussed quite a few times, and you should be able to find solutions by searching these discussions. Look in the “stickies” at the top of the forum, DIY repairs. :nerd

    Where can I get a new blower motor resistor?

    I replaced the blower motor resistor and the control unit with new parts from rockauto (ACDelco). I’ve checked the fuse in the dash fuse panel and it is good.

    Why is my blower motor resistor not working?

    CLICK HERE TO RESET YOUR PASSWORD! Help! Fan quit working on all 4 speeds. AC light & recirc light still light up and AC compressor clutch engages when turning fan on in AC mode, but not getting the fan to work. I replaced the blower motor resistor and the control unit with new parts from rockauto (ACDelco).

    Carmakers use these three common wiring methods to supply power and ground to the blower motor in a manual system using a blower motor resistor. In one design, the car maker supplies battery power to the speed switch, which switches the power to the appropriate connection on the blower motor resistor.

    So a half speed driver request will result in the blower motor controller pulsing the ground connection off twice as often as when the fan is running at full speed. Carmakers use these three common wiring methods to supply power and ground to the blower motor in a manual system using a blower motor resistor.

    The squealing noise happens most often in the winter during cold startups and may disappear as the motor heats up. If you ignore the noise, the bearing will continue to wear to the point where the motor won’t start at all. The reason I’m not including the motor resistor as a suspect is because it usually only controls the lower speeds.

    Variable speed blower motors don’t use a blower motor resistor. Instead they use a blower motor speed control or a power transistor. Variable speed motors are most often used in vehicles with automatic climate control.

    When does a blower motor resistor need to be replaced?

    If the resistance is out of specs, the resistor must be replaced. For example, in this photo we measured the resistance of this blower motor resistor. According to the service manual, it must be around 4-5 ohms. In our case the ohmmeter shows open circuit, which means the resistor has failed.

    Why does my furnace blower not turn on?

    If you see or hear the fan turn on, your blower motor is not the culprit. If the fan does not start, you have a wiring issue (circuit breaker trips) or motor problem (circuit breaker does not trip). While your thermostat may be at fault, only an HVAC technician can diagnose and remedy the issue correctly.

    Why is my Jeep Wrangler not running hot?

    Like the blower motor itself, the resistor is not a safety risk to other components, but it definitely makes things uncomfortable until a replacement is installed. Not having enough engine coolant (antifreeze) is something that will make your engine run hotter. Ironically, it also will prevent your vehicle from generating enough heat.

    When do you need a new blower motor?

    If you are getting 120 volts to the motor and it is not starting then you have a blower motor problem and either need another new blower motor or a new blower motor run capacitor. If you are not getting voltage to the blower motor out of the control board then you probably need a new control board again.

    Why does my fan blower not come on?

    If it does not come on then you might have a control board fan relay that is not sending 120 volts to the blower motor or a bad blower motor winding. You might try to change wires (speeds) on the blower motor to see if that fixes the problem.

    I replaced the blower motor resistor and the control unit with new parts from rockauto (ACDelco). I’ve checked the fuse in the dash fuse panel and it is good.

    Where does the battery go in a blower motor switch?

    The BLK/ORG wire is the one that connects to terminal 2 of the blower motor switch. Inside the blower motor switch this battery power goes nowhere. Battery power is available on terminal 2 of the blower switch connector (BLK/ORG wire). This battery power is now diverted to terminal 3 of the blower switch harness connector (LT GRN/WHT wire).

    What happens when you turn the blower speed knob?

    To be more specific, as you turn the blower speed knob… the blower switch ‘opens’ and ’closes’ two contacts. The opening and closing of these contacts is what diverts the incoming blower motor current to different resistors within the blower motor resistor assembly.

    Why is there no ground on my blower motor?

    It seems, too, that the black ground wire on the blower motor (accessible from just below the dash) has NO ground potential. I ghetto jumpered a 16 gauge wire from the back of the metal clip on the ground wire to the dashboard impact bar/brace and the fan turns at variable speeds with the knob!

    Blower Motor Resistor Replacement – YouTube Blower fan not working – 2004-2014 Ford F-150 and other models. Blower Motor Resistor Replacement If playback doesn’t begin shortly, try restarting your device.

    What kind of wire does a blower fan use?

    I ghetto jumpered a 16 gauge wire from the back of the metal clip on the ground wire to the dashboard impact bar/brace and the fan turns at variable speeds with the knob! All positions of “on” work – low, medium, high, and full blast.

    Why does my blower fan keep getting ground on Black Wire?

    The AC system itself has trouble and has a leaky AC compressor (which I also bought a new one to replace!). I broke out the old trusty multimeter and it seems as though the purple wire on the fan motor gets +12v at all times with the fan switch anywhere but OFF.

    Without it, the AC system will not be able to circulate any heated or cooled air. The blower motor relay controls the current used to power the blower motor, and is subject to the constant on and off switching. Over time, it can eventually wear out.

    The electronic module that controls the speed of the blower motor is called a blower motor control module. In some cars, the blower motor has only 4 or 5 fixed speeds. In this case, the speed of the blower motor is controlled by a blower motor resistor.

    Where does the power transistor go in a blower motor?

    The power transistor has 4 wires: two come from the climate control system control unit, one is the ground, one goes to the negative terminal of the blower motor. The service manual advises measuring the voltage at the blower motor, then if not OK, at the power transistor and so on.

    In those applications, the HVAC control head is a digitally controlled unit and uses various sensor inputs to determine when to supply heat. Based on the driver’s input to the blower speed switch, the HVAC control head sends a digital signal to the blower motor speed control module.

    Why does my blower fan not start when I spin it?

    But yes in general if the motor will run when you give the blower fan a spin then usually the problem is the starting capacitor (if present) OR a bad start relay control switch.

    Where can I get a blower motor replacement?

    BLOWER MOTOR FAN REPLACEMENT LOCATION. BLOWER MOTOR NOT WORKING – YouTube If playback doesn’t begin shortly, try restarting your device. An error occurred. Please try again later.

    How to replace a blower resistor and motor?

    Easy video on how to replace blower resistor and motor with 1 screw driver and in about 10min. Remove glove box, pop bottom panel off to gain motor access. Disconnect cables to motor and resistor. Remove hose from motor, it should just pull off with little effort. Unscrew motor and resistor. Screw new motor and resistor in. Connect hose to motor.

    Is your furnace blower motor not working and there is no air coming out of your vents? Perhaps your blower motor has burnt out and you need a new one. Or maybe it is just simply not getting any power therefore not turning on. In this video I show you how you can check if your HVAC blower motor is bad or if it is the control board that is defective.

    Why is my air conditioning not working on my Jeep Liberty?

    Dana Dowling/Demand Media The air conditioning system in your Jeep Liberty compresses a refrigerant and blows the resulting cold air into the passenger cabin. When this system is not working properly, it can be because the pressure in the AC lines is too low, or because the compressor has failed.

    The blower motor is the component responsible for pushing air through the vents of your vehicle’s heating and air conditioning systems. Without it, the AC system will not be able to circulate any heated or cooled air. The blower motor relay controls the current used to power the blower motor,…

    How to replace a blower motor resistor on a Jeep Liberty?

    This is a video on how to replace a blower motor resistor in a Jeep Liberty M/Y 2002-2007 (KJ). Tools required are a Phillips screwdriver (or 7mm socket), a 1/4” drive 5/16”/8mm short and if desired a 1/4” drive universal socket, a 1/4” extension with a 1/4” ratchet and a small flathead screwdriver. Loading…

    How does the heater on a Jeep Liberty work?

    At the simplest level possible, the heater works by passing hot coolant from the engine into a tiny radiator called the heater core. At this point, the blower motor blows air across the it and the newly heated air blows on to the driver and passengers. If the heater has stopped working in your Liberty, this process has failed in one way or another.

    What should I do if my Jeep Wrangler blower is not working?

    Jerry – You had mentioned that if the blower fan simply didn’t work at all you should look into replacing the switch plug. I have replaced the switch and the resistor and still no fan. Both of the fuses (behind the glove box and under the hood) appear to be working. Where can I find the blower fan to test it? Newbie Jeep owner here – 2000 TJ w/2.5.

    Dana Dowling/Demand Media The air conditioning system in your Jeep Liberty compresses a refrigerant and blows the resulting cold air into the passenger cabin. When this system is not working properly, it can be because the pressure in the AC lines is too low, or because the compressor has failed.

    You turn the blower on by completing the circuit to ground. First check the fuse and all connections. Second, check to see if there is any power at the blower motor. Place two large straight pins in the plug of the blower motor but leave the blower motor plugged in. Place a voltmeter across the two pins.

    Why is the blower motor on my 2007 rabbit not working?

    If blower motor works on full speed then it is the resistor which is under the glove box on 2007 rabbit. Video on YouTube available. I have same issue, fuses are fine, fan does not work at all, have pulled blower and applied power- it works.

    Why is my rear AC not blowing at all?

    The front works fine. Any thoughts are appreciated. What you can do is get a short finder so you dont have to keep replacing 30A fuses, but unplug the relay in the back for the blower motor & see if the short is before the rear HVac or inside the rear HVAC.

    Why does my Chevy Tahoe blower not work?

    unknown at this time. probe the yellow wire going to the blower and to a ground for the power circuit test at any speed for juice if you have power for the most part you likely have a broken motor. if you have no power at all including at the high setting there is still a big fuse in the under hood block and should be rated at 50 amps.

    What happens if a heater blower has no power?

    A blower motor without power will not be able to produce any air pressure, and as a result the heating and air conditioning system will be left with no air coming from the vents.

    What do I need to troubleshoot furnace blower motor?

    Removing the old furnace blower motor is not overly complicated and can be done in relatively short time and with tools you will usually have around the home. Things you will need: A pen and paper, or something to take notes with. Screw driver, depending on your model, it may be a flat head or philips head.

    How to check if the blower motor belt is the issue?

    To check if the blower motor belt is the issue, first ensure that the furnace door is fully closed properly, as the furnace will not work if the door is open due to a switch on the inside of the furnace door. Locate and turn off the main circuit breaker or safety switch for the furnace, to ensure there is no power going to it.

    Why is the motor on my blower not working?

    If there is power, pull the connector off the motor and use your multimeter to check the motor for continuity. No continuity = bad fan motor. As an aside, a fan motor with bearings on the way out draws extra current and often causes the resistor to overheat, so if you replaced the resistor because it popped my money’s on a worn fan.

    What are the symptoms of a failed blower motor resistor?

    Blower motor resistor problems. Problems with a blower motor resistor are common in many cars. The most common symptom of a failed blower motor resistor is when the heater fan only runs at high speed and doesn’t work at low speeds.

    What happens when a heater motor resistor fails?

    If the resistor shorts or fails, it may cause the blower motor to remain stuck on one fan speed. The heating and air conditioning systems may still function at one speed, however the resistor will have to be replaced in order for full functionality to be restored. 2. Blower motor does not work on certain settings

    What should I do if my Bentley Blower Motor is not working?

    You say you’ve checked the fuse and replaced the resistor. Wiring rarely breaks, so the next logical step is to access the fan motor per instructions in the Bentley service manual and use a multimeter to check for power at the fan motor connector when the switch is on.

    See: how to check a fuse in a car. If a blower motor is bad, it will need to be replaced. The blower motor replacement costs from $320 to $650, depending on the car. In many cars it’s fairly easy; the blower motor is located behind the glove box and held by 3-4 screws.

    Why is the blower motor on my Dodge Ram not working?

    Discussion in ‘ Tech Info ‘ started by HeavyD, Dec 10, 2016 . Ok was driving & doing errands today, blower motor working good – no problems. Then after dropping stuff at home, got back in the truck & blower motor does not do anything. Checked the #4 fuse, even swapped it with another & still nothing.

    Where is the relay on a blower motor?

    Correction assuming 97 is same (probably is)… Fan relay is as posted before on top of the duct work left of the resistors you can see both behind the glove box if you take it out. The purple wire comes from the relay/resistors according to fan speed selected.

    When did the blower on my Toyota stop working?

    Pirates here at the dealership wanted $169.0 😆 Yeah NOT. Blower stopped working last Thursday, It came back on Friday after I wiggled the blower motor resistor, went back out Saturday. It doesn’t work on any speed.

    Why is my blower motor on my Ranger not working?

    I recently experienced a problem where the blower motor in my 1996 Ranger quit working. When working with your blower motor you have to first understand that the blower basically works in the opposite manner of most automotive electrical components. Normally you switch on a positive current to an electrical component to turn it on.

    How are the resistors arranged in a blower motor?

    Heating systems with just 3 or 4 speeds use a motor resistor along with the speed switch to regulate the motor speed. The resistors are arranged in series to reduce the voltage in steps, depending on where in the series you apply power. Blower resistors can burn out. When that happens, you lose that speed.

    What happens when the blower motor does not work?

    Case Details: The blower motor does not work though it was independently checked and found to be OK. All fuses are good. If the blower motor is not working when attached to the circuit, the resistor unit is more likely to be at fault. The resistor unit is differently located on various motors but will either be on the motor base or the heater body.

    Why is my Peugeot 206 blower motor not working?

    The resistor unit is differently located on various motors but will either be on the motor base or the heater body. If the resistor unit is defective it will need to be replaced. Sometimes however the blower motor might not start because of a fault in the control panel. How to repair a Peugeot 206 heater blower motor which has stopped working?

    Can a Peugeot blower motor resistor be replaced?

    To access it the glove box and heater assembly will have to be removed. Use only an original Peugeot blower motor resistor replacement which can be sourced from a Peugeot parts store. Replacing the resistor will take a couple of hours.

    What should I do if my blower fan wont come on?

    You will need to test with a voltmeter and see if your fan motor is getting the required 110 to 125 volts AC out of your control board to start the motor. I would suggest setting your thermostat to the “Fan ON” position. You should be getting 120 volts out of the control board.

    What do you need to know about Ford E350?

    Anti-theft indicator, courtesy lamp switch, dome/map lamp, illuminated entry, power mirrors, radio memory, remote keyless entry module, visor lamps WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.

    What are the symptoms of a bad heater motor resistor?

    Symptoms of a Bad or Failing Heater Blower Motor Resistor. 1 1. Blower motor stuck on one speed. A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. The blower 2 2. Blower motor does not work on certain settings. 3 3. No air from the vehicle’s vents.

    If the blower stops with either of these steps, the problem is in the HVAC control module. However, if the blower continues to run at high speed with either of those tests, replace the blower motor control processor. Just as an FYI, the retail price of the blower motor control processor is $280.34.

    How can I tell if my blower speed switch is faulty?

    Test for power at all the blower speeds by moving the blower speed switch through all positions. A faulty resistor loses power at different positions on the switch. High blower speed has direct power to the motor from the switch. If there is no power indicated on high blower speed, the problem is most likely the switch or the fuse.

    What to do if your truck stop blower doesn’t blow?

    Replace the connector and add a extra ground from the blower motor. Also you can have a dirt plugged evaporator. Remove the blower motor and vacuum out the evaporator coils. Then use a garden hose and towel to spray it clean with scrubbing bubbles. Also check the rec door operation.

    What to do if your blower motor melts down?

    Look around and above the blower motor area for a connector with two heavy wires in it. You know the melted one? 1995’s are famous for this connector meltdown and my 1993 doesn’t look so good. Replace the connector and add a extra ground from the blower motor. Also you can have a dirt plugged evaporator.

    How to test a Mercedes Benz fan blower motor regulator?

    This is the blower motor resister, which controls the fan speeds. Disconnect the multi-wire connector from the blower motor resister next to the blower motor. Start the car and turn the air conditioning on. Test the connector for power at the terminals in the connector using the voltmeter. If there is power, reinstall the connector to the resister.

    Why does my Mercedes-Benz A / C blower run uncontrolled?

    But under fault conditions it could fail as ‘always on’ or ‘never on’. Mostly (according to this forum) a failed BR causes the a/c blower to run uncontrolled. Btw your WIS a/c circuit diagram is not identical to mine for W208. However the blower motor/regulator part is the same.

    Why is my Mercedes Benz blower motor not working?

    If there no power is found, the blower motor resister is the culprit and needs to be replaced. As a note, 85 percent of the time when the blower motor does not come on or operates at one speed only, the blower motor resister is at fault. The resister emits substantial heat from the resistance it supplies and eventually burns up.

    What to do if your blower motor wont start?

    You can test by testing with a voltmeter set to “Volt AC” between the high-speed blower wire (usually black) and the white neutral wire. If you are getting 120 volts to the motor and it is not starting then you have a blower motor problem and either need another new blower motor or a new blower motor run capacitor.

    Why does my blower not come on neither heat or cooling mode?

    Hello, I have heat pump unit with a backup auxiliary heat. My blower will not come on neither heat or cooling mode. Blower will no running on neither auto or fan. I’d jumped the motor and is working. My capacitor and transformer is also good too.

    How long does it take to replace a Mercedes blower motor?

    There is a motor and relay below the motor that many folks replace at the same time, since both are known to fail. One form member even has an excellent write up about the replacement, including pics. Very helpful! It’s about a 2-3 hour job, less if you’ve done one before. Thanks guys, I’ll look again. Must have missed it first time round

    Why is my Mercedes-Benz S500 heater not working?

    What are common reasons my Mercedes-Benz S500 has heater problems? While there are a variety of reasons your Mercedes-Benz S500 heater is not working, the most common 3 are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor.

    What to do if your blower motor stops working?

    Personally, I replaced mine when it stopped working and that solved the problem. There is a motor and relay below the motor that many folks replace at the same time, since both are known to fail. One form member even has an excellent write up about the replacement, including pics.

    Why does my Mercedes Benz blower stop working?

    Im from Malaysia… i just want to ask why my blower stop working after i charge the gas in the system. like it suddenly stop. is it because its a burden to the blower? and..the compressor didnt stop eventhough i released all the gas. maybe there’s problem at the controller. but whats the reason this happen? sorry my english kinda suck. Hi.

    There is a motor and relay below the motor that many folks replace at the same time, since both are known to fail. One form member even has an excellent write up about the replacement, including pics. Very helpful! It’s about a 2-3 hour job, less if you’ve done one before. Thanks guys, I’ll look again. Must have missed it first time round

    Can a blower motor fail on a pathfinder?

    Both of my Pathfinder are 2002’s — some of the earlier cars actually had a blower motor that was prone to fail when the motor failed it would short out the controller ……….. so that is the only thing that you need to look into.

    Why is my blower motor constantly turning on and off?

    Its not like it turns on or off for minutes at a time, its almost constantly switching on and off, it will switch on and then before it has time to even get to the full speed setting it would turn off again. The odd time it will work fine. Would this be a part starting to fail, or a wire connection problem you guys think?? Appreciate any help!

    How does a Mercedes Benz blower motor work?

    That is the design. The blower motor (A32m1) is powered from circuit 30, which is the unswitched battery voltage, via fuse f25 (30A). I second the above posts.

    Both of my Pathfinder are 2002’s — some of the earlier cars actually had a blower motor that was prone to fail when the motor failed it would short out the controller ……….. so that is the only thing that you need to look into.

    What causes the a / C blower to run uncontrolled?

    Mostly (according to this forum) a failed BR causes the a/c blower to run uncontrolled. Btw your WIS a/c circuit diagram is not identical to mine for W208. However the blower motor/regulator part is the same. Still the Regulator?

    What happens if you have a bad blower motor?

    The blower motor is the component responsible for pushing air through the vents of your vehicle’s heating and air conditioning systems. Without it, the AC system will not be able to circulate any heated or cooled air.

    Why is my central air fan not working?

    Another common and easily remedied situation that sometimes results in a central air conditioner fan not working is a dirty, clogged air filter. Your system’s air filter traps dust, dirt and other airborne pollutants to keep indoor air and internal cooling system components cleaner.

    How to diagnose a blower motor problem?

    Place two large straight pins in the plug of the blower motor but leave the blower motor plugged in. Place a voltmeter across the two pins. Turn on the ignition and turn the blower switch through each position.

    Why is the blower motor on my Nissan Altima not working?

    Unfortunately the blower motor on the Altima is not working. The Blower motor LED lights light up to high speed but no fan. I am no where near the car ( My wife has it far away ) but I’m wondering if it is a fuse or the motor?

    What happens when you replace the blower motor?

    Ya had a motor go at around 72k never replaced a blower motor otherwise in a million miles just German engineering I guess. Update: Since replacing the blower motor, the fan controls seems to have taken on a mind of their own. The fan speed will increase or decrease +2/-2 levels randomly.

    Why is my blower motor on my execline not working?

    I’m just posting this in case someone else has the same issue – the blower motor on my 2013 Execline TDi started working intermittently for a couple of weeks. Mainly at idle, it would stop blowing, but when I got moving again it would kick on again. Once it finally quit I pulled the codes and got: …..

    Why is the blower motor on my Touareg not working?

    The heat was working fine. The AC would turn on and work for about 30 seconds and then a deep humming noise would start from behind the dash towards the glovebox and… AC/Heater blower motor on my 2005 Touareg stopped working. Dealer estimate $1,000+ to replace. Motor cost around $250.

    When do you need to replace a blower motor?

    If you don’t feel any airflow coming out of the vents, it may mean that a problem with the blower motor has developed to the point where the component is entirely inoperable. In this case, you’ll have to replace it with a new motor.

    One of the first symptoms of a bad or failing AC blower motor relay is a blown AC blower motor relay circuit fuse. If the blower motor relay develops any sort of problem that hinders its ability to properly limit and distribute power, it may cause the blower motor fuse to blow.

    Why is my furnace blower not running?

    If your furnace is going off on limit you might have an air flow problem like a dirty filter, dirty blower, slow blower motor (might need a new capacitor) stopped up evaporator coil or too much gas pressure. All of these can cause the furnace to over-heat and go off on limit.

    What does a blower motor resistor do?

    Definition. A blower motor resistor, typically located beneath the passenger side dashboard, contains three resistors, or sets of terminals designed to generate voltage in proportion to electrical current. These resistors allow the blower motor to function at lower speeds.

    Where is the blower motor resistor located?

    The blower motor resistor is located under the dash on the right hand (passenger) side. It’s near the firewall, just below the windshield.

    Why is my electric leaf blower not working?

    The most common reason why your electric blower won’t run is because there is something wrong in the cord or the plugs. Not getting power to the machine makes it a pretty useless piece of equipment. Check these pieces of equipment to make sure that nothing is cut, worn, torn, bent or otherwise damaged.

    What does it mean when your furnace blower is not working?

    A furnace blower motor that stops pushing warm air out is not the same as a blower that is forcing only cold air into your home. If you have cool air but a steady airflow, your blower motor is working but your heat exchanger or burner is not. Check the furnace flame for a complete blue color.

    Disconnect cables to motor and resistor. Remove hose from motor, it should just pull off with little effort. Unscrew motor and resistor. Screw new motor and resistor in. Connect hose to motor. Connect cables to motor and resistor. Turn on car and test AC. Thanks for watching! Loading…

    Correction assuming 97 is same (probably is)… Fan relay is as posted before on top of the duct work left of the resistors you can see both behind the glove box if you take it out. The purple wire comes from the relay/resistors according to fan speed selected.

    How many volts does a blower motor have?

    At low is might have 5V, M1 7 ish, and M2 9 ish volts. (note mine is not working and I think resistors are bad I get 11.9V on hi 11.73 v on all other speeds lo, m1, and m2. Anyone ever measure what voltages are normal to speeds ?

    If you are getting 120 volts to the motor and it is not starting then you have a blower motor problem and either need another new blower motor or a new blower motor run capacitor. If you are not getting voltage to the blower motor out of the control board then you probably need a new control board again.

    I have an older Maytag furnace that will fire up but the blower motor doesn’t come on, after a minute the the limit switches will turn of the furnace because it will get to hot. I already replaced the motor, the limit switches, and the motor board but I still have the same problem.

    What are common reasons my Infiniti FX35 has heater problems?

    What are common reasons my Infiniti FX35 has heater problems? While there are a variety of reasons your Infiniti FX35 heater is not working, the most common 3 are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor.

    When the blower motor fails, the air conditioner and heater may still work, and heat or cool may be felt at the vents, but the air pressure will be dramatically decreased. This Read More When the heater control valve fails, adjusting the temperature may not change the air temperature at the vents, whether hot or cold.

    What are common reasons my Infiniti FX35 has heater problems? While there are a variety of reasons your Infiniti FX35 heater is not working, the most common 3 are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor.

    What should I do if my blower motor stops?

    Replace blower motor. If you have a variable speed blower motor, replace the blower motor speed control module. If you have a three or four speed blower motor, remove the blower motor relay. If the motor stops, replace the relay. Alldatadiy.com and Eautorepair.net are professional-grade shop manuals—period.

    Why does my Chevy Silverado blower keep running?

    Also, if you smell burning plastic or smoke begins to enter the cabin when the blower is going, that is also a sign you have a faulty blower motor. Finally, if you hear that the blower motor is still running even when the Silverado ignition is in the “off” position, chances are, your blower motor needs replacing. Figure 1. Test your HVAC controls.

    When do you Know It is time to replace your blower motor?

    If you notice your blower motor is not functioning on certain speed settings, has a burning plastic smell, or the blower continues to run with the ignition in the off position, it may be time to replace your blower motor. Here are some steps you can take to confirm whether or not this replacement is necessary.

    You will need to test with a voltmeter and see if your fan motor is getting the required 110 to 125 volts AC out of your control board to start the motor. I would suggest setting your thermostat to the “Fan ON” position. You should be getting 120 volts out of the control board.

    How to choose the right air conditioner blower motor?

    In order to get the right blower motor for your air-conditioner, the contractor has to take a number of things into consideration, including the type of drive, the diameter of the motor, rotation direction, horsepower, voltage, speeds, and size of the capacitor.

    Why does my AC fan control module stop working?

    Since this relay works the blower motor as well, you may notice that the air flow in the cabin of the vehicle is significantly reduced. The module helps to regulate how hard the blower motor works when needed, which is why it will cease to work with this part.

    The blower resistor is connected in series to the blower fan motor. This means that the current running through the blower motor, and its’ speed is therefore controlled by the resistor value. The user chooses a fan speed by selecting a speed which then connects one of the resistors in the blower resistor pack.

    If the thermostat, breakers and access panel doors check out, the blower motor itself may have failed. Motors have a long useful life, but they do seize up or burn out in time. You may want to call a repair person at this point. A qualified air conditioning expert can test the motor, find the proper replacement and install it.

    The blower motor is the part of your HVAC system that uses the most energy, so it may very well be the culprit if you see a significant rise in your utility bills. An aging, problematic, or dirty motor has to work harder to properly circulate conditioned air throughout your home, which leads to higher energy consumption.

    Why is my air conditioner not blowing air?

    If you have a belt driven blower motor fan and the fan is not blowing any air through the vents, then it is possible that the belt may have become worn over time, moved out of place or become damaged. You can check for this problem by listening to the AC unit when it is turned on.

    Why is the blower on my Nissan club not working?

    Checked the two fuses, and they are both good. I can hear the AC compressor kick on if I lower the temp, but no air flow coming from the vents. Switching from defrost, floor, dash vents and no air flow. Manually adjusting the fan speed and still no air flow. It looks like there is a resistor plug that inserts into the blower assembly.

    What to do if your Silverado blower won’t work?

    Head under the hood and check the blower motor wiring to make sure it is getting power to it. If it is, then your only option is to remove the blower motor and have it tested or replaced. You can do so yourself if you have the equipment, or have it done at the dealership or parts store. Figure 3. Silverado blower motor and fan assembly.

    The blower motor fuse is fine (the one on the driver side shock tower, right?). This blower motor problem has been discussed quite a few times, and you should be able to find solutions by searching these discussions. Look in the “stickies” at the top of the forum, DIY repairs. :nerd

    What causes a blower motor to not work?

    If the blower motor resistors’ internal components fail it may cause the blower motor to malfunction, or not function at all on one or more of the settings. This can also be caused by a blower motor switch, so a proper diagnosis is highly recommended if you are uncertain of what the issue may be.

    How can I tell if my blower fan is a relay?

    The only way to test and see if it is a blower motor relay would be to test with a voltmeter to see if the motor is getting 110 volts to the motor when it starts going off and on. I hope you can easily find and fix the problem.

    Can a bad blower motor cause climate control to fail?

    Of course, your climate control systems can fail in many ways, so it’s good to be able to identify the signs of a bad blower motor and get it taken care of without replacing a bunch of other perfectly good parts.

    Why is my AC not working in my car?

    If you do not feel any air or if you only feel air coming through the vents on certain settings, the problem may lie with the AC’s blower motor or the blower motor resistor. Sometimes blower motors and/or their resistors will fail and stop pushing both hot and cold air through the vents. Step 3: Check the strength of airflow.

    What causes an air conditioner motor to stop working?

    Another common problem that can be caused by air conditioner blower motors is the formation of ice, or icicles, on, or around the air conditioner unit and vents.

    Is there a problem with the GM blower motor?

    If you have a General Motors car or truck from 2002 through 2008 you’ll probably have a blower motor issue at some point. In many cases it’s a problem with the GM blower motor module. The most common complaint when this part fails is the motor will not turn on at all.

    What causes a blower fan to not work?

    When this happens, you may notice that you will not feel anything blowing out of the vents at all. This may also cause the blower motor to work intermittently. A blower fan is connected to the negative battery terminal (also called ground) on one end and to the positive battery terminal through a blower motor resistor on the other end.

    How can I tell if my blower motor is working?

    If the blower motor works it’s time to check some voltages at the module. There’s a power wire that comes from the control panel. On most models it’s either red or purple. This power in wire should turn on a test light with the ignition on and maximum speed selected. The black wire should indicate a strong ground.

    Where is the blower control switch on the dashboard?

    The blower control switch on the dashboard controls the circuit flow of the blower motor to adjust the voltage from low, to medium, to medium-high, to high. When on high, the circuit bypasses the blower resistor.

    As explained in the HVAC Blower Motor Guide, an air conditioner blower motor and assembly is basically the fan inside the air conditioning system that forces the cooled air, via the AC cooling coil, through the vents and into the room space that is being conditioned.

    Why does my blower not work at high speeds?

    Blower works on slow speeds, but not on high speed. Check for bad fuse or bad high speed relay. Swap the high speed relay with another relay with the same part number. Also, check the fuse for the control side of the high speed relay. Make sure the ground side of the high speed relay is working. Blower works on some speeds but not others

    How do you turn on a blower motor?

    With a blower, you essentially ‘turn on the ground’. The blower always has a positive current going to it when the key is on. You turn the blower on by completing the circuit to ground. First check the fuse and all connections. Second, check to see if there is any power at the blower motor.

    The motor should spin at its highest setting. If it does then you have a problem with the connection at the plug. If not, you have a bad motor. The blower gets it’s power from a relay. In the case of my 1996 Ranger the relay is behind the passenger side headlight. If there is no voltage and the fuses are good, check the relay.

    Where does the power from the blower motor come from?

    The power for the blower motor comes straight from a 30 amp fuse that is hot in run. It is the fuse directly above the flasher. This black box contains relays. It’s located just behind the passenger side headlight and in front of the container for the air filter. Here’s the relay box without the lid on it.

    What to do if your blower motor relay is not working?

    Blower Motor RELAY not Working – YouTube If playback doesn’t begin shortly, try restarting your device. Videos you watch may be added to the TV’s watch history and influence TV recommendations. To avoid this, cancel and sign in to YouTube on your computer.

    How does a blower motor speed controller work?

    The blower motor speed controller is not a resistor array. The speed controller provides a pulse width modulation (PWM) of the voltage to the motor on the Yellow/Blue wire so that a variable voltage is obtained. Control of the motor speed controller is via a voltage signal on the White/Purple wire.

    You can also check for power to the blower. If you pull the drivers side front window plastic the output from the ccu is pretty accessible. If you checked the external spots then I would pull the blower and inspect that. not hard to get to the blowerunit.

    Unfortunately the blower motor on the Altima is not working. The Blower motor LED lights light up to high speed but no fan. I am no where near the car ( My wife has it far away ) but I’m wondering if it is a fuse or the motor?

    The blower motor starts, turning fan blades that circulate cold air from the evaporator coils, through the home’s ductwork and into each room. If the blower motor fails to start, nothing happens. The living spaces gets uncomfortable as the cooling cycle stalls. Most thermostats control both central air and central heat.

    The only way to test and see if it is a blower motor relay would be to test with a voltmeter to see if the motor is getting 110 volts to the motor when it starts going off and on. I hope you can easily find and fix the problem.

    What should I do if my blower fan won’t start?

    Step 1: I would start by confirming that the blower fan will operate. Your system probably has a manual FAN ON switch on the thermostat, or if not, there may be a FAN ON push pull switch right on the fan limit switch in the air handler.

    What to do if your help blower motor is not working?

    It can be replaced (soldered in) with a part from Radio Shack for about $1.79. (search resitor pack) Usually if its the thermal fuse the blower fan will still work on switch position “4”/high. If you get nothing at any setting, its most likely the switch or a wire/connector issue.

    What should I do if my heater fan doesn’t work?

    Replaced 10 amp fuse , blower relay,blower motor,dash s dash switch and switch out under the hood relays. Seems no power to anything when checked with a test light. Blower motor *resistor* been tested? ..

    What to do if your blower motor relay is failing?

    For this reason, if you suspect that your blower motor relay is having a problem, have the vehicle’s AC system diagnosed by a professional technician from YourMechanic. They will be able to determine if the car will need a blower motor relay replacement, or a different repair, to bring full functionality back to your AC system.

    In one design, the car maker supplies battery power to the speed switch, which switches the power to the appropriate connection on the blower motor resistor. In those applications, the motor resistor reduces power for the slower speeds and the blower motor has a permanent ground connection to complete the circuit.

    Why does my blower fan spin at a certain speed?

    It send a certain amount of voltage to the motor to have it spin at the requested speed you select on the control head. To do this, there are resistors built into the unit to control the voltage. If you are not familiar with how electricity works, basically it comes down to this…resistance causes heat.

    What happens if air handler blower speed is too low?

    This is because the evaporator coil will not be able to adequately dehumidify the space in need of cooling. On the other hand, if the blower speed is too low, your evaporator coil is at risk of “freezing.” This could result in liquid refrigerant floodback that would likely cause compressor failure.

    How does a blower motor resistor control the fan speed?

    The blower motor resistor controls the fan speed of the blower motor and the resulting change in air pressure produced by the movement of the blower fan. It accomplishes this by regulating the electric current that powers the motor.

    Can you remove the blower motor from a furnace?

    Now that you have disconnected all the wires, you can now move to removing the blower motor assembly, which includes the blower motor and fan, from the furnace. To do this, you will need to remove the nuts and or bolts that hold it in place.

    Another common symptom of a faulty blower motor resistor is a a blower motor that does not function on certain settings. If the blower motor resistors’ internal components fail it may cause the blower motor to malfunction, or not function at all on one or more of the settings.

    What causes a blower motor to overheat?

    Decreased airflow causes the blower motor resistor to overheat and fail. Reduced airflow also causes the blower motor to work harder, draw more current and that can cause repeat blower motor resistor failures. Blower motor is drawing too much power. Check the cabin air filter for clogging.

    In a situation where the motor doesn’t work on any speed, the most likely causes are: a blown power supply fuse, a bad motor ground connection, bad motor speed control module or a failed motor. On all systems, a failed blower motor is least likely. Start by checking the blower fuse and HVAC controller fuse.

    When to replace a car heater blower motor?

    If your car’s heater doesn’t work, only works on certain speeds, or only cold air comes out, you may need to replace the heater blower motor. 1. Weak airflow from the vents 2. Fan only blows at certain speeds 3. No air from the vents Average rating from 130,525 customers who received a Vehicle Engine Cooling Inspection.

    Why is my Toyota pickup heater not working?

    While there are a variety of reasons your Toyota Pickup heater is not working, the most common 3 are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor.

    How can I tell if my blower motor resistor is bad?

    Attach the clip lead of the test light to a good ground like a bolt screwed into metal, and touch the sharp probe end to the terminals on the fuse. An indication of power at both terminals of the fuse determines that the fuse is good. If one of the terminals has power and the other does not, the fuse is bad. Replace the fuse as needed.

    Is there a red wire on the blower fan?

    This is a 1995 Suburban K2500 4×4 6.5 TD. There isn’t a red wire at the fan. On the blower itself there is a purple wire (+12v whenever the blower speed is anywhere other than ‘off’) and black wire which should presumably be ground. I have tested the black wire for continuity to ground and theres almost none at all.

    Where does the purple wire come from on a blower motor?

    The purple wire comes from the relay/resistors according to fan speed selected. The purple wire should have battery voltage ~ 12V when on hi. At low is might have 5V, M1 7 ish, and M2 9 ish volts. (note mine is not working and I think resistors are bad I get 11.9V on hi 11.73 v on all other speeds lo, m1, and m2.

    When does my AC blower motor come on?

    When it does come on, usually after about 20 minutes of drive time, it blows great. At times it will come on as soon as I crank engine, at times it will not come on at all.

    The motor should spin at its highest setting. If it does then you have a problem with the connection at the plug. If not, you have a bad motor. The blower gets it’s power from a relay. In the case of my 1996 Ranger the relay is behind the passenger side headlight. If there is no voltage and the fuses are good, check the relay.

    How to turn off the blower motor on a Volvo?

    – Select 30782577 (or 30782664 to deactivate if needed). Enter part number if not listed – After – run passenger control status (wording may change in future VIDA updates.) gone into the sleep mode. The fan will blow for 15 minutes at half speed with the air directed to the dashboard air outlets.

    What kind of car has a blower motor?

    Help, Advice, Owners’ Discussion and DIY Tutorials on Volvo’s stylish, distinctive P2 platform cars sold as model years 2001-2007 (North American market year designations). I recently noticed that the blower motor in my wifes 2002 V70 is running, even when the the key is out of the ignition.

Posted In Q&A