Radiator fans run constantly, 92 100S (similar to A6). Suggestions?

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377 - 03 Mar 2009 12:16 GMT

Any suggestions? If you think it is a relay or sensor, please tell me
part no or location of part and appearance if you know. Thanks, Mark.

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Jon B - 03 Mar 2009 14:16 GMT

> Any suggestions? If you think it is a relay or sensor, please tell me
> part no or location of part and appearance if you know. Thanks, Mark.

At a guess probably the fan temp sensor in the radiator. It's usually a
fairly sizeable item ((for a sender) though not too expensive), trace
the wires back from the fans to the radiator, you'll find it. Don't undo
it though till you have a new sender as you need to get the new one in
pretty sharpish before you drop all the coolant.

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TonyJ - 04 Mar 2009 00:56 GMT

>
>> Any suggestions? If you think it is a relay or sensor, please tell me
[quoted text clipped - 7 lines]
> pretty sharpish before you drop all the coolant.
>

You may also want to check the three fan relays to see if they are
sticking. Two are located in the relay box on driver's side in front of
the windshield under the hood. The third is under the dash by the
driver's left knee. It is a big double-wid relay for the fastest fan
speed. If the fan is very loud this may be the problem because the fan
thermoswitch on the bottom of the radiator controls the slow and medium
fan speeds.

The fan is controlled by switching the ground connections for the three
speeds so it could be a ground wire from the fan shorting to ground.

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