XC90 L5-2.5L Turbo VIN 59 B5254T2 (2004)
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:
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the A/C is off
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no faults are detected by the Engine Control Module (ECM).
Note! The engine cooling fan may have a post-run of up to approx. 6 minutes after the engine has been turned off. The time for the fan's
post-run depends on engine temperature, temperature in the engine compartment and pressure level in the AC-system.
Warning! Be careful since the engine cooling fan may have a post-run after the engine has been turned off.
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 VIDA.
Cooling fan for control modules, turbocharger (TC) (certain markets only)
The function of the cooling fan is to cool the control modules in the control module box in the engine compartment. The control modules may be
damaged if they overheat.
The engine control module (ECM) activates the fan depending on the signal from the engine coolant temperature (ECT) sensor and the temperature
sensor in the control module.
The cooling fan is in the hose between the control module box and the firewall.
The engine control module (ECM) can diagnose the cooling fan. The fan can be activated using VIDA.
