Blower motor?
Not totally sure this is relevant, but my solar-panel sunroof in the current A8L I own managed to wear out the dual cylindrical blower motor ... I could hear the fan running, but the output from the vents was like a 3 year-old trying to blow out the candles on a birthday cake. Prior to this, the unit did made a very slight whining noise but you could only really hear this outside the car, to be honest.
After much rooting around, I discovered that the central metal (copper?) ring/commutator was worn out and required replacement. A quick trip to the forum's sponsor and a replacement used blower unit (around £100) was sent to me. Fitting it was a bit of a pain but full service was restored instantly. "It looks like two small washing machine drums fitted back to back" is the best description that I can offer.
(Apologies if I've got the wrong end of the stick - Ainars is a knowledgeable chap and he's probably right)
P.S. A8Parts did tell me that the blower motor on solar panel sunroof-equipped cars do fail more regularly due to almost constant use - even with our inclement weather.
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2010 B8 S5 Sportback quattro 3.0 Supercharged in Sprint Blue (current girlfriend)
2000 D2 A8L quattro 4.2 in Audi silver (my ex-girlfriend)
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