Mechanics

RADIATOR FAN RUNS CONTINUOUSLY

1993 Audi 90

Electrical problem
1993 Audi 90 6 cyl Front Wheel Drive Automatic 65922 miles

My radiator fan recently started running after engine shut off. Today, it started running and now runs until thel battery is dead. When hooking up jumper cables, the fan starts up again before engine is started. I had the fan switch replaced about 4 months ago after the car overheated. It has recently started getting colder outside so perhaps coolant related?
Thanks,
Scott
Avatar
Latchkey
October 31, 2008.




Check the cooling fan relay could be sticking closed -switch side

Tiny
Rasmataz
Nov 1, 2008.
Ok - this may sound stupid but when I opened the relay box, it appears to be missing some of the relays - and specifically some of those relating to the cooling fan. I don't think anyone removed them recently either. Is it normal to have open spots? And when you say switch sides - can you be more specific? Thanks much.

Tiny
Latchkey
Nov 1, 2008.
Switch sides-means the switch side of the relay


http://www.2carpros.com/forum/automotive_pictures/12900_fan_relay_4.jpg

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Tiny
Rasmataz
Nov 1, 2008.
Ok - so Ive located that panel. How would I know if the switch is stuck? #2 and #11 are empty. Or am I looking for another one on or near the radiator? I am a bit of a novice as you can see. : -)

Tiny
Latchkey
Nov 2, 2008.
Remove the no.3 and 6 and see what happens

Tiny
Rasmataz
Nov 2, 2008.
So I pulled each one of them when the car was being jumped and kept coming back and forth testing different combinations, but the fan continued even when both the 3 and 6 were pulled - together and separate. I would have expected the fan to stop altogether at some point - with the switch removed yes?

Tiny
Latchkey
Nov 3, 2008.
The cooling fan circuit is shorted somewhere to a power source

Tiny
Rasmataz
Nov 3, 2008.
Ok - so any idea how a novice would be able to fix that? Or should I bring it to a service center? Also, what should be the approximate cost to do so? Thanks for all your help.

Tiny
Latchkey
Nov 4, 2008.
Sir-my adivse is bring her in to the pros this problem can be complicated for a DIY. As for the cost the flat rate labor varies with location could be $70.00-$130.00 per hr.

Tiny
Rasmataz
Nov 4, 2008.
Do you happen to have the wiring diagram for this model that I could see on this site? Also, is it possible that the run on fan switch needs replacing? Is there a way to test that?

Tiny
Latchkey
Nov 6, 2008.

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