Checking the Engine Cooling Fan (FC) and Cooling System

Checking the engine cooling fan (FC) and cooling system

Checking the engine cooling fan (FC) and cooling system
Check the coolant level.
Missing coolant may be due to:
- leakage in the cooling system
- the coolant has boiled.
Leakage in the cooling system can be caused by:
- leakage in the radiator, heater unit, hoses etc.
- defective cylinder head gasket.
If the coolant has boiled it may be due to:
- a defective expansion tank cap
- a defective thermostat
- a defective engine cooling fan (FC)
- a blocked radiator.

Checking the expansion tank cap
Disconnect the hose between the expansion tank and the radiator.
Pressure test the expansion tank. The pressure is given on the cap (normally 150 kPa).

Checking the thermostat
Start the engine. Allow the engine to idle. Read off the engine coolant temperature (ECT).
Check that the thermostat opens at approximately 90°C. Hold the hose from the thermostat housing to the radiator. The hose becomes warm at the radiator when the thermostat opens.
Remedy as necessary.

Other information:
- To check for leaks in the cooling system, see under the Information tab.
- The cooling system boils at approximately 130°C.

Was a fault detected?

Yes - FAULT FOUND

No - Checking the engine cooling fan (FC)

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Checking the engine cooling fan (FC)

Note! The electric cooling fan may have a post-running time of up to approx. 6 minutes after the engine has been shut off. The time for the electric cooling fan's post-running depends on the engine's temperature, temperature in the engine compartment as well as the pressure level in the AC system.




- Ignition on.
- Activate the engine cooling fan (FC) by clicking the VCT2000 symbol.

If the electric cooling fan can be activated in all selectable speeds:
- There is no malfunction in the electric cooling fan.
- Check the engine temperature sensor.
- Check the AC pressure sensor.
Remedy as necessary.

Other information:
- The electric cooling fan can be activated at different speeds. Possible speeds for the electric cooling fan is dependent on model year and engine.
- For further information, see the wiring diagram.





Is the engine cooling fan (FC) working?

Yes - FAULT FOUND

No - Checking components and connections

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If no malfunction has been found
If no malfunction has been found in any of the diagnostic tests, report the result of the troubleshooting to the sales company/importer according to normal report procedure.

Select "Continue" to exit.

Continue - FAULT FOUND

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Checking components and connections




- Ignition off.

If the electric cooling fan cannot be activated in all selectable speeds:
- Check the fuse, power supply cable and ground lead for the engine cooling fan (FC).
- Check the wiring between the engine control module (ECM) and the engine cooling fan (FC) module. Check for damage.
- Check the connectors to the engine cooling fan (FC) control module and Engine Control Module (ECM). Check for damage to pins and connections.
Remedy as necessary.

Then check:
- Function of engine cooling fan.
- Ignition on.
- Activate the engine cooling fan (FC) by clicking the VCT2000 symbol.

Other information:
- Checking wiring and terminals Checking Wiring And Terminals
- For further information, see the wiring diagram.





Is the engine cooling fan (FC) working?

Yes - FAULT FOUND

No - If no malfunction has been found

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