Had exactly same thing on mine. First intermittent, then stopped working, would work again slowly for a while when hit. Thought carbon brushes worn in motor, took it out to check, brushes were still in reasonable condition but commutator were worn out, some of the contacts completely through. I think it is common problem if You have solar sunroof, blower does much more work and wears out. Got mine from A8 parts I think paid £45, checked condition before putting in and brushes and commutator were almost like new. Ask them to supply one from a car without solar sunroof as they will have more chance of being in better condition.
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