It might as well be blower motor gone. Quite common in cars with solar sunroof as it's working overtime. When mine went it would sometimes work , sometimes not and if you hit near it or went over pothole it would start working again. Eventually it got slower and more non working than working. I was hoping it's just the brushes worn but turned out that while brushes were low it was mostly due to slip ring/commutator wear so I got replacement from A8parts. I did ask them for one from a car without solar sunroof and the one I received was very good condition with minimal wear.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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