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Old 08-30-2012, 10:48 PM   #2
Registered User
Join Date: Aug 2012
Location: San Francisco Bay Area
Posts: 35
My Ride: E39
The black box that is making noise is called a DISA flap. You should replace it. The part number is: 11-6-17-544-805. When you take it out you'll see that the flap is most likely separated.

The squealing is hard to isolate on the video. You replaced all pulleys? Sounds like a deflection pulley or alternator. You can use a long screwdriver as a stethoscope to isolate.

Good Luck!
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