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Author Topic: Radiator Fan on after key in the ignition  (Read 1855 times)

Offline Lucasprss

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Radiator Fan on after key in the ignition
« on: 07 January 2015, 21:09 »
Hello all, just another newbie. I've just got my Golf GTI 2002 mk4.

So everything is working fine no issues except.. If I put the key in the ignition so the electrics come on the Radiator Fan comes on for around 5/10 minutes.

Do we think this is a faulty sensor/switch.? Any feedback would be helpful thanks.
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Offline Wazzzer

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Re: Radiator Fan on after key in the ignition
« Reply #1 on: 09 January 2015, 16:08 »
Yes something is faulty; the fan shouldn't come on unless either the air con is turned on or the temp gets up too high
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Offline Mr_Orange

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Re: Radiator Fan on after key in the ignition
« Reply #2 on: 11 January 2015, 08:12 »
I recall there's a fan relay resistor thing under/near the battery, that throws a wobble and causes this and other issues.
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Offline Mr_Orange

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Re: Radiator Fan on after key in the ignition
« Reply #3 on: 11 January 2015, 08:20 »
I just looked this up. Should help your diagnosis

http://uk-mkivs.net/topic/224371-mk4-golfbora-radiator-fan-fix/

Looks like a complicated fix, I'd start by locating and swapping out the speed control unit.
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