The fan cannot be repaired and must be replaced if necessary. First check that the fault is neither in the thermal switch nor in the wire by applying 12 volts directly to the motor terminals.
The fan motor either works or it doesn't. If the motor rotates, then it is normal.
WARNING: Do not run the motor for more than a few seconds with the fan removed.
Fan Motor Test/Radiator Fan Relay Test
The radiator fan relay is located in the relay box in the engine compartment.
Remove the relay from the relay box.
Connect relay pins 1 and 2 to the battery and at the same time connect an ohmmeter to pins 3 and 4. The resistance should be 0 ohm.
Turn off the voltage, the resistance between pins 3 and 4 should be infinity.
Check the resistance between pins 1 and 2 with battery voltage disconnected. Required value - 0 Ohm.
Checking the thermal switch
The thermal switch is installed next to the radiator drain fitting, at the bottom. When the coolant temperature rises, it turns on the electric fan. The switch is faulty if the electric fan does not turn on when the radiator is hot.
Checking the thermal switch is as follows:
Disconnect the thermal switch connector.
Bridge both pins of the connector with a wire. If the fan turns on, replace the thermal switch.
If the fan does not turn on, check the contacts and the correct connection of the fan motor connector, check the wiring of the relay and the fan motor according to the wiring diagram.
Fasten the new thermal switch with a tightening torque of 30 Nm, applying sealant to the threads.
Fill with coolant.
Warm up the engine and let it idle until the fan turns on. Check coolant level.
You can check the thermal switch and, in the removed state, connect an ohmmeter to its contacts.
Place the thermal switch in hot water up to the thread and measure the resistance.
At 85°±3°C the resistance should be 0, at temperatures below 8°C it should be infinity.