Checking the cooling system fan (VW Sharan 1)

A faulty fan can cause the engine to overheat. If the fan breaks down while driving, you should stop, let the engine cool down, and then drive at medium speed to the nearest service station. During such a trip, be sure to monitor the coolant temperature and the engine overheating indicator light. If necessary, stop for a while to let the engine cool down.

If the fan does not turn on when the engine warms up, check the thermal switch located on the side of the radiator:

• turn on the engine and let it run until the fan comes on;
• slowly remove the expansion tank cap, releasing steam gradually;
• place the thermometer in the expansion tank. The temperature should be between 92-97°C. At this temperature, the fan operates at the first speed. At a temperature of 99-105°C, the fan operates at the second speed. If the fan does not turn on, then pull both wires out of the thermal switch and connect them together. Turn on the ignition. The fan should turn on immediately. If this happens, replace the thermal switch, and then check again.

The fan motor is protected by a fuse that may blow. If the fuse is OK, check the fan motor:

• disconnect the wire plugs and install a jumper between the red-black wire terminal and the positive terminal of the battery;
• connect the brown wire terminal to the negative pole of the battery using a jumper.

If the fan does not work, replace it. The cause of the malfunction may be damaged wires.

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