Question about 2004 Volkswagen Jetta

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My 2004 jetta is overheating. I replaced the thermostat, thermo sensor, and fan switch. I did notice the fans are not turning on during normal running. could this be the problem? Could it be the Fan control module not turn on the fans?

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Yes actually it cud be. i'm having the same problem and the only i havent changed in the thermostat.

Posted on Aug 23, 2012

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Run a wire from the battery to the fans,if they start, then the temp sensor will need replacing.

Posted on Jul 15, 2010

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Do the fans come on when the engine overheats? If so nothing wrong with the circuit and the thermostat(not thermo switch!) or radiator is to blame.
Test the fan. There are 2(if you have A/C fitted) Disconnect the electrical plug from the fan. Run 2 wires from the battery straight to the fan and see if the fan comes on. (Be careful when connecting not to short circuit the wires. Theres a lot of power in the battery!) Polarity does not matter. This is a direct current motor so reverse polarity will only make the fan turn in the wrong direction. If the fan turns reconnect its electrical connection and move to the next step.
To test the fan circuit locate the thermo switch. It is on the bottom right of the radiator and has 2 wires connected. disconnect the electrical plug and short circuit the 2 wires by inserting a piece of wire into the connector with the ignition on. The fan should come on. If it does the thermo switch is at fault and needs replacing.
With the electrical sorted there is not much else. Like I mentioned it is either the radiator(blocked) or the thermostat(sticking)
Radiator can be taken to a service centre and have them clean it out for you. The thermostat cannot be repaired and needs to be replaced. It can be removed and the engine will still operate, but just take longer to warm up. I'm not sure on the '99 model, but it is usually located on the right hand side of the engine at the bottom on the water pump housing.

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