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Hi,
Porsche has a TSB out on these very noises. It is TSB 1/00 7018. It states two possible causes:
- loose or sagging electrical harness - solution: Wire Tie Harness away from Dash, Vents, Fan Motor Housing, etc.
- Air Supply Ducts hitting Fan Motor Housing, or rivets on backside of Dash - solution: Relocate Ducts or place Foam Tapr between Ducts and any contact points.
Hope this helps...
Happy Motoring!... Jim'99
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