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My 4K quattro has had the same chronic problem. The squeal was coming
from the alternator belt which must be tightened tighter than I would normally
think was good for it. The car has a fairly powerful alternator which is
driven by an old style "V" belt. Most manufacturers (including Audi) are now
using serpentine belts, and I think that slippage on high output alternators
is part of the reason. Once my fear of overtightening was overcome the
problem has gone away.