1. The thermal switch is screwed into the coolant inlet. It turns on the electric radiator fan when the coolant reaches a certain temperature. The switch should be checked if the fan does not turn on when the radiator is hot. Test conditions: Check the electrical wires, relay and fan motor according to the diagram. The thermostat and pressure reducing valve in the radiator cap are OK. If these elements are faulty, the thermal switch will not be able to turn on the fan, since it is not heated by the coolant.
2. Disconnect the plug from the thermal switch.
3. Unscrew the thermal switch.
Attention! Coolant will flow out of the inlet port. Place a container to collect liquid.
4. Hang the thermal switch in a container of water. Heat water slowly.
5. Using an ohmmeter, monitor the current flow through the switch. At a temperature of +91°C current must flow.
6. Leave the water to cool and check that at a water temperature of + 84°C, the current stops flowing.
7. If the values are not as required, the switch should be replaced.
8. Screw the switch with new gasket with force 10 Nm.
9. Fill in coolant.
10. Warm up the engine and leave to idle until the fan turns on. Check the coolant level again.