2. Disconnect the thermoswitch plug if the resistance is correct.
3. Bridge both contacts of the plug with a piece of wire. For two-stage thermal switches, all three contacts must be bridged. If in this case the radiator fan turns on and works, then the thermal switch is faulty.
4. Attach a jumper to the plug and insulate it to prevent short circuits. This will enable the journey to continue.
If the above method did not give the desired result, then check the fan relay. When a jumper is installed on both power wires of the thermal switch, when the ignition is switched on, a clicking of the triggered contacts of the switching relays should be heard.
Otherwise, bridge terminals 30 and 87 of the relay and put it back in place. The fan should turn on when the ignition is off. In this case, this means that the relay is faulty.
Attention! Setting the jumper is just a way to continue the trip. It is unacceptable to use it all the time.
If the fan does not work even when the jumper is installed on the relay, then check the fan itself.
5. Disconnect the fan power plug, and instead, run an auxiliary wire from the positive battery terminal to the contact on which the wire with red-black insulation is fixed. The negative charge for the brown wire comes directly from the negative battery terminal.
If in this case the fan does not work, then it is faulty and must be replaced. If the fan has started working in this case, then check the relays, plugs, as well as all connections regarding the thermal switch and the radiator fan anyway. You can continue driving, but the battery wires leading to the fan should be well insulated.
Power for the second fan stage, if any, is provided through the red/blue insulated wire. To check the operation of the fan at this stage, connect the wire (+) (-) to the contacts of the fan motor plug, to which I connected a wire with red-blue insulation.
For diesel engines, a breakdown on the board with additional resistances may be the cause of a malfunction of the radiator blower fan (located in front of the engine compartment, on the left side) or defective relay for the second stage of fan rotation. In this case, check the relay as described above.
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