Audi 80 Mk II (1991-1995) - 93 2.0 Rad fan draining battery

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Tue 7 Oct 2008 12:49
93 2.0 Rad fan draining battery - TimOrridge
Following on from my sluggish battery thread

I have found the possible cause for this. On saturday morning I stopped car after a drive and the engine was not near 70c but rad fan was on. Didnt think much of this so came out to car after 2 or 3 hours and battery was flat as a very flat thing. There were no lights or anything totally drained. So after a jump lead was connected the rad fan kicked in again even before I had started engine. So for the time I have removed the lead to the fan but what would the possible cause of this? It has happened before w while back but it had "fixed itself".

Any ideas welcome? It has had a new thermo switch last time which hasnt seemed to help? Could it be a short in the fan or wires? It seems to be intermittent
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Tue 7 Oct 2008 18:57
93 2.0 Rad fan draining battery - mak
I don't know if this helps but I am sure the fan also comes on to cool the engine when the car is stopped after a journey. Therefore, there must be another sensor apart from the radiator thermo-switch. I understand that there is an additional thermo-switch near the injectors in the cylinder head. This may be the cause.

Hope this helps.
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Thu 9 Oct 2008 22:44
93 2.0 Rad fan draining battery - PeterRed
I used to have one of these many years ago and for some unfathomable reason now run a Passat. With my cynical hat on, I'd say that practising "bangernomics" with a VAG product is not the wisest course of action if you actually rely on it. Maybe something Japanese might be better.
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Sat 11 Oct 2008 17:08
93 2.0 Rad fan draining battery - mak
Further to my previous post.
Is the fan running with the ignition turned off? If so, I would look at the 'thermal-switch' which was for models with radiator fan run-on. If fan constantly running with ignition turned on then must be the radiator thermo-switch.
I think these make a great 'bangernomics' car, I have had mine for nearly 14 years without any problems and starts first time. Like everything else, needs regular servicing and maintenance. Parts are easily sourced through GSF.

MAK
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