I'd guess the sealing foam is dead (archive)
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Posted by Max Fretter (NZ 87 735i) on February 10, 2002 at 17:35:58:
In Reply to: buzzing posted by Pietro on February 10, 2002 at 14:27:29:
(posted from: (203.98.9.62))
Hi Pietro... the stepper motors do make a weird buzzing sound, but I;d guess the new bang is the flap closing as usual - juts now the sealing foam around it's edge has died and so there's no padding for that final close-tight stage.Max
I have a 92 735il with 70000. When I turn the climate control fan off or on I can hear an intermittant buzzing noise coming from the dash. The noise just goes away. But I can now really hear the vent doors open and slam closed.
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