What causes a blower motor to stop running?

What causes a blower motor to stop running?

Most blower motors ground through the case of the motor when it is screwed into place or by a small ground strap from the case to the body of the car. Over time, the ground connection can become corroded or loose, causing the motor to function intermittently. Lee Sallings is a freelance writer from Fort Worth, Texas.

Why is there no power to my AC compressor?

No 12 volts at comp plug. Went to heater control panel, have 12 V at ac switch, (with blower on) and so switch is sending it down the line but where it goes to, I don’t know. Can’t find any fuse or breaker labelled AC.

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.

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.

Why does my GM blower motor not turn on?

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. However, it’s also possible for the blower motor to have speed control issues or continue running at all times even with the ignition off.

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).

What does Black Wire mean on GM blower?

The black wire should indicate a strong ground. If you have a good ground and verified power into the module, yet have no electricity flowing to the fan you probably have a bad module.In many cases when I find the problem with the GM blower control module I also find signs of moisture in the heater case that contains the motor and module.

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.