XC70 L5-2.5L Turbo VIN 59 B5254T2 (2003)
Radiator Cooling Fan Control Module: Description and Operation
Engine Cooling Fan (FC) / Engine Cooling Fan (FC) Control Module
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).
WARNING: The engine cooling fan (FC) may start itself for some time after the engine has been switched off. This is normal.
The engine cooling fan (FC) and its control module are behind the radiator.
The engine control module (ECM) can diagnose the engine cooling fan (FC). The fan can be activated using VADIS/VIDA.
