I have had a recurring problem with my 2002 Golf. The radiator fan will come on as soon as I start the engine and will stay on after the car has been switched off.
I have recently replaced the coolant sensor but this has failed to fix the problem and furthermore I now have a coolant sensor warning come on every time I switch on the car. The temperature gauge is locked at zero and the heating unit is now blowing cold air. I am now being told that my thermostat needs changing.
I am not convinced that this is the problem because the car was previously heating up normally and the fan would still stay on. The only fault code present is the O2 sensor which I am told is unrelated.
I am thinking that perhaps there is a fault present with the radiator coolant switch which would explain all of the above but my mechanic tells me he has already checked this out and it is working fine.
Has anyone ever come across a similar problem and could you please offer some advice?
The radiators fans unfortunatelly is the only area that does not report to the ECU.
So you will not get a fault code.
Need to take it to a mechanic, that knows the procedure to check the fan controller. Its in the workshop manual..
Basically you jumper some of the connections to see if each fan works individually, if they both work, then the controller is faulty.
If you still have the old coolant sensor, MUST be a green top, put it back.
The older black top sensors fail all the time.
I have the same problem. The battery goes flat as a result. I have had a lot of work done on it and it has cost me A LOT of money and still the some problem occurs.
I've got the same symptoms as you and have been told to replace the themostat but I am looking into different options. I've had the coolant gauge replaced and the same problem keeps happening. I've been told it could be sticky relay?
How did you go with yours, would love to know if you've had it fixed and what was involved, what was fixed, and how much it cost. Please help!
I also, have this issue which has just started occuring. My battery is now dead and dropped a cell so I require a new one.
At first I didnt think much of it because I assumed the fan running for 1-2mins was normal, but after walking from the car I didnt realise it was still running. Is there anything I should be looking at? Any others recently had this issue?