Have you tried hot wiring the fan? (Fiddly I know), it may be the fan that's packed in, mine hasn't worked since owning the car and I've heard of 2 others with dead fans, a common failure I think and easy swap
It wouldn't usually be a problem but the recent high temperatures we've had made me realise the fault.
We have a B6 A4 too and whenever the turn the AC on on that the aux fan kicks in.
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