2001 Volkswagen Golf Radiator Fan Always on

Engine Cooling problem
2001 Volkswagen Golf Two Wheel Drive Automatic 65000 miles

Really hope someone can help. We have just bought vw golf SR auto 1.6 2001. Bout a week ago the radiator fan started coming on even when the engine was not hot (after about 2 mins). It would stay on constantly even after engine was switched off for about half an hour. We therefore have a constantly flat battery. Now as soon as battery is charged an ignition is switched on the fan comes on, and drains the battery again!
Someone told me to follow the top radiator hose to the engine and I would find the radiator coolant temp sensor(green) and should change it. I did this and it made not difference. Someone else said there is a sensor to the bottom right side of the radiator itself which will be the fault and should change this one. I have not changed it yet but pulled the electrical connector out of this sensor and the fan carried on going and surely doing this should stop the fan yes. It is driving me crazy and is so anoying. Please please help me stop my fan
Do you
have the same problem?
Wednesday, October 29th, 2008 AT 2:51 PM

1 Reply

I had the same problem. I changed both sensors, tryed another coolant fan control modual and relay. But same problem. So I decided to rewire the fan. Or I should say made it work like the older systems with just a thermistate switch and relay controling the fan. I made a crude drawing of the connections.
To do this you must disconnect the fan electrical connection and leave it disconnected. This will cause a trouble code to be stored and the check engine light will come on. If you jump the connections as shown in the crude drawing I made it will fool the computer into thinking it as still connected. If you use the original relay as I did you also have to jump those connections too. You can use a lighter relay in place of the original one and it is the same as jumping it. Oh, sorry the file type of my scanner is not supported so I can't upload my drawing. Well hope this gives you the idea of what I did. Connect the small side of the relay to the batery and the thermistat switch in a series. Put a fuse in line for safety. Now connect the heavy side of the relay to the batery and the fan motor in series with a 40 amp fuse. Now when the coolant gets hot enough it will activate the switch causing the relay to close the fan circuit and the fan will run untill the temp drops enough to open the switch and in turn open the relay and shutting the fan off.
It worked well for me. Hope it will for you also.

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Tuesday, May 19th, 2009 AT 9:15 PM

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