Question about 2000 Audi A4

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Hi I have a 2000 Audi A4 1800 wagon. The auxillary fan does not operate and car overheats in heavy traffic if the airconditioning is on. I have replaced the thermostat, waterpump and fan switch at the bottom of the radiator. The fuses are fine and the fan turns when bridged out. The only thing left to check is the fan relay switch. Unfortunately I cannot locate it. Can anyone tell me where to look. regards Nick

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It may be in the fuse box it might look like a little box shape about 1" square that pulls out of the fuse box ......cheers

Posted on Sep 18, 2010

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When the vehicle begins overheating, what are the conditions of the radiator hoses? Are both firm, or only one and the other soft? Are both hot, or is one hot and the other only warm?

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A failed (stuck shut) thermostat will also result in one very firm hose (highly pressurized and nowhere to go with the thermostat shut) and one relatively soft hose.

You can take the radiator cap off (BEFORE it pressurizes) and watch the water level as the car runs. If the thermostat is opening and waterpump is pumping, you will see fluid flow once it gets to operating temperature.

Watch your engine fan and see if it is engaged or just spinning freely. When warm and the engine shut off, the fan clutch should be engaged making the fan more resistant to turn. If it spins freely, the clutch is failing.

Check the area around the radiator and between it and the condenser for obstructions to airflow.

Obviously check the condition of the coolant for heavy scale/sludge. The 3.0/3.5 engines are notorious for turning coolant into thick rusty puddy.

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