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Old 19th July 2013, 11:58 AM
green A8 green A8 is offline
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Join Date: Dec 2012
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Thanks for the replies gents and the helpful suggestions. I can confirm that it is indeed the heater fan that is playing up and not the engine fan or any other fan or motor.

This fault only seems to happen when the car has been parked in full sun and the interior has become very hot. I left the car in the garage overnight, started and ran the engine up to temp then stopped it no problem. no fan noise or slight breeze through the airvents. I checked under the bonnet and all was normal. I then took the car for a thirty mile non stop drive and returned it to the garage, again no problem on engine shutdown, all was normal. At this point the Wife suggested going down to our local garden centre as she wanted to buy a few items. I drove the car, again no problems we arrived at the garden centre and had to park the car in full sun. The heater fan still behaved itself. Wifey bought a load of stuff and took her time as per, so being a lazy bugger, rather than lugg it all the way to the car I brought the car to the loading area of the garden centre a trip of no more than 200-300yards. That's when it happened! the heater fan stayed on at the lowest speed setting. even though I'd switched the ignition off, and removed the key.

There's no display on the AC controls as the ignition is switched off and the key was out of the ignition. Pressing every switch on the air con unit yeilded no results, except 'rest' which performed as advertised, but turned the fan on to a much faster setting. On driving the car back home with the air con cooling the interior and parking up in the garage, the fault had gone away again.Everything was back to normal. Very strange.

So, any ideas gents? I'm thinking perhaps an overheated relay or sensor somewhere, as this fault only seems to happen when the cars interior is very hot.

I coupled up Vag-Com VCDS no faults were found.

I look forward to hearing what you make of this Gents, and await your further comments with interest.

Paul.
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