problem with cooling fan, having a life of its own..

[Tzummie]

have a problem with the cooling fan of the main radiator: It starts and stops by itself, when the engine isn't or hasn't been running> It looks like something's triggering the fan to start running. Any idea what this could be? The switch in the radiator sending faulty signals? Or?
Any info appreciated!
thnx.
T.

[andyg plym]

i had it where the fan was on all the time it was the thermo switch on the bottom of the rad

[Tzummie]

thanks. Was that even with ignition off?

[Mikes2]

With the ignition off, the only fan speed that will run is #1.

This is the afterrun system which triggers this. Things to check are sensor on water rail, relays in the fuse box, resistor pack, the afterrun controller and the wiring to/from each of these parts

[Tzummie]

thanks. what's best bet where to start looking?
Car hasn't been driven for a long while (100km past year...)

and what relay number to look for?
cheers!, T.

[EvenM]

Hello

I also have a problem with a cooling fan living its own life. Did you solve your problem ? Any other tips?

[UrS4boy]

After-run Auxiliary Coolant Pump and Fan Switch and 324 Control Module Info

Hello I also have a problem with a cooling fan living its own life. Did you solve your problem ? Any other tips?

Could be related to the after-run pump switch and control module:

After-run Auxiliary Coolant Pump and Fan Switch and 324 Control Module Info:

http://forums.quattroworld.com/s4s6/msgs/21503.phtml

[LHD_Kid]

I've been trawling through pages on the forum and also 7zap but cannot find the part number for the radiator fan thermal switch - the 3 pin one screwed into the bottom of the main radiator.

Can anyone help?

[Mikes2]

3 pin is 191 959 481 C

[John.]

It looks to be 191 959 481 C

Found in 7zap under electrics then look for radiator fan section.

[LHD_Kid]

Thanks chaps!