Quote Originally Posted by JustCruisn View Post
The best resource I found when I had to solve this years ago.
http://pics.tdiclub.com/data/516/A4_...ting_Rev_7.pdf

If you decide it is the resistors, just consider that the whole fan can be bought new for about $100 each.
That's interesting. It used to be around $800 to fix back in the day, say 2004/5 when I first had to fix mine. I ended up doing the resistor board fix and I haven't had to touch them since. Now some 14 years later the original fans are still in the car and it is approaching 450,000 kilometres.