How does a fan solenoid work?
The clutch engages and makes the fan turn when the valve opens, sending air pressure to overcome a spring and push the Piston Friction Disc (PFD) against the friction material. It disengages when the valve closes, allowing the clutch solenoid to exhaust air and let the spring return.
Where is the fan clutch solenoid located?
It’s located on the front of the engine on the fan drive on the electronic version. There are vanes inside the fan drive which the fan speed sensor/solenoid reads (Hall Effect like a crank sensor) It sends a signal to the ECM and engages the fan accordingly for optimal cooling speed.
What is a solenoid controlled fan clutch controlled by?
The solenoid controls whether the fan gets air supply or not. The solenoid is controlled by the ECU. The ECU gets inputs from the coolant temp sensor and the manual fan override switch. It works by air pressure acting internally on a diaphragm closing the gap so the friction material contacts and drives the fan.
Is solenoid used in fan?
If you fan drive is ECM controlled, it will use a normally open solenoid. The A/C pressure switch actuates the fan drive when the refrigerant pressure reaches the maximum switch setting. It is normally open and is used with normally open electrical systems.
What is a solenoid controlled fan clutch is controlled by?
The solenoid controls whether the fan gets air supply or not. The solenoid is controlled by the ECU. The ECU gets inputs from the coolant temp sensor and the manual fan override switch. The air conditioner also affects whether the fan is on or not.
How does a fan clutch work?
A fan clutch is a thermostatic engine cooling fan that can freewheel at low temperatures when cooling is not needed, allowing the engine to warm up faster, relieving unnecessary load on the engine. As temperatures increase, the clutch engages so that the fan is driven by engine power and moves air to cool the engine.
What kind of fan does a Freightliner have?
Freightliner Columbia The engine fan on my 2007 Freightliner The engine fan on my 2007 Freightliner Columbia, Detroit Diesel Series 60 engine, comes on before the engine is even at operating temperature. The check engine light also comes on at that moment. It t… read more sevn103
What is the voltage of the Selenoid on a Freightliner Century 98?
Discussion in ‘ Freightliner Forum ‘ started by crosstown, Jul 18, 2011 . have freightliner century 98 with detroit 60 and radiator fan runs continuously. The voltage to the selenoid is 0 v when harness connected and it is 13.7 v when disconnected.
When does the fan clutch air solenoid turn off?
When air is taken away, it closes the clutch and the fan turns with engine speed. The ECM will not command the Solenoid OFF until it reaches 212 degrees-220 Degrees F, or if Oil temp, and intake temps run high as well. The engine should not reach anything hotter than 225, that is the max engine temp that detroit wants it to run.
Why does the engine fan keep coming on and off?
The engine fan will only stay on for a few reasons. Mosf of the time the fan clutch solenoid is bad. It is an electric solenoid that turns the fan on and off. You can find it by following the air line that comes from the fan clutch hub. In you case, it may be the A/C high or low pressure switch since you are getting an A/C trouble code.