Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSVOLVO2004V70 L5-2.5L TURBO VIN 59 B5254T2REPAIR AND DIAGNOSISRELAYS AND MODULESRELAYS AND MODULES - COOLING SYSTEMRADIATOR COOLING FAN CONTROL MODULEDESCRIPTION AND OPERATION
2004 Volvo V70 L5-2.5L Turbo VIN 59 B5254T2
Radiator Cooling Fan Control Module: Description and Operation
2004 Volvo V70 L5-2.5L Turbo VIN 59 B5254T2SECTION 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.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.