Check the level of the coolant.

Find out from the customer whether the problem has occurred previously

Check the condition of the radiator. In particular, check for signs of deformation - traces of leaks - external dirt - fluid with excessive traces of rust.

Move onto step 2

• Restore the correct level

End of diagnosis

• See table X10 ENGINE COOLANT LEAKS

End of diagnosis

• Replace the radiator

End of diagnosis

• Clean the radiator

End of diagnosis

• Replace the radiator

End of diagnosis

• Clean the inside of the radiator and cooling circuit

End of diagnosis

Check that the thermostat is working properly

Move onto step 3

• Bleed the system as per standard procedure. Replace the thermostat if the problem persists

End of diagnosis

Test using an Examiner

Activate the fan in active diagnosis mode

If the fan works, ensure it comes on at the required temperature

Move onto step 4

• Activate the fan motor directly, replace if it does not work, check the following in order if it does work: specific fuses and relays on the engine bay control unit, condition of 1st speed resistor, specific wiring continuity and insulation. Check that the control unit activates the fan speed relays. If not, replace the i.e. control unit. If it does, replace the engine bay control unit

End of diagnosis

With the engine running, check there is no gurgling in the coolant reservoir

Move onto step 5

• Replace the cylinder head gasket

End of diagnosis

• Check the condition of the coolant pump vanes

End of diagnosis

Check that the fault is no longer present

Incorrect selection of diagnostic procedure

Incorrect selection of diagnostic procedure