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Cooling Fan switching on/off too quickly when running AC

95 GTI VR6 with 140K miles and "running" strong except - yesterday temps were in the 90's and in traffic my AC started making a growling noise then shut down and then turned on after a few seconds then off. After car started moving turned system back on - quickly cooled no problems. During idle high speed fan will turn on for a few seconds then switch off and then cycle again. Took the car to an AC specialist - but not VW specialist and said pressures were fine but he did notice the fan switching on and off which could if the outside temps were high enough could cause the system to get too high of pressure and shut down the system since the fan isn't really cooling down the coil. Ok, but what would fix the problem - radiator switch, switch located on the thermostat housing or is it the Fan Control Module? Is there a way to test the Fan Control Module?
Reply to
S Timinski
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here in the uk it is a common fault of the golfs that the fan internal resistor blows preventing the fans from operating properly. VW are aware of the fault. Suggest yours may be similar. Do some research...you may get it do under goodwill from VW

Reply to
RaT

That's a multi speed fan and you need to check the speeds first. With the AC on the fan should run at low speed. as temps go up it will jump to the 2nd speed. If it sounds like a jet engine, then it's on the 3rd speed.

Reply to
Woodchuck

Tried jumping the AC pressure switch (fan portion) and it will turn on the fan - but I don't think I'm getting the third speed. Tried jumping connectors at the radiator and I get the fan to go but it doesn't sound like a "jet engine" just fast. Is there any way to force the third speed?

Reply to
S Timinski

Don't think I'm getting into the third speed - low speed seems fine - and I think its running in second - but I cant seem to get it in third. Is the function of running on third part of the Fan Control Module or the fan unit itself? Is there a way to jumper it to the third setting bypassing the control module? Also when I took it to an A/C place they said the Fan Control seemed like it was "clicking" - but since he wasn't a VW specialist he couldn't give a proper diagnosis on the electrical. When the temps are in the 70 or low 80's and driving normally the temp readings get and stay at about 37-38 under normal load so i think the AC portion (compressor/condensor/evap and expansion valve) is working. Ordered a Fan Control Module from the dealer using the recall part code which cost about

60 dollars versus the 200 that they would normally charge - found that info on VWVORTEX and the kit is normall for the Corrado SLC but others have tried it and it works unmodified for 95 and later GTI VR6's. Ordered it because I don't think my after run fans seem to be working as well. Any info on the third speed would be helpful. Thanks in advance.
Reply to
S Timinski

Reply to
News

The only time the fan goes to 3rd speed is by last resort to save the engine from atomic melt down if speeds 1 & 2 are dead. The 3rd speed may come on if you are driving through "Death Valley" but I wouldn't know because it's one place on earth I don't want be be in.

Reply to
Woodchuck

Reply to
S Timinski

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