Engine Cooling Fan (FC) / Engine Cooling Fan (FC) Control Module
the engine cooling fan (FC) may run on for approximately 6 minutes after switching off the engine. The time for the engine cooling fan run on depends on the engine's temperature, the temperature in the engine compartment and pressure level of the air conditioning (A/C) system.
Because the engine cooling fan (FC) can run on after the engine has been switched off great care must be taken.
The engine cooling fan (FC) has two functions. One is to cool the engine compartment, the other is to cool the condenser when the air conditioning (A/C) compressor is working.
The engine control module (ECM) transmits a pulse width modulated (PWM) signal to the engine cooling fan (FC) control module. The control module then activates the fan at different speeds. The speed of the engine cooling fan (FC) is determined by the engine control module (ECM), depending on the coolant temperature (based on the signal from the engine coolant temperature (ECT) sensor) and the vehicle speed.
The temperature conditions for engagement of the different engine cooling fan (FC) stages may vary slightly, depending on the engine variant and the equipment level. The temperature conditions apply when:
- the A/C is off
- no faults are detected by the Engine Control Module (ECM).
The engine cooling fan (FC) and its control module are behind the radiator.
The engine control module (ECM) can diagnose the engine cooling fan. The fan can be activated using the diagnostic tool.