Quote:
Originally Posted by alvinabed
+1 i think it's the AC flaps in the center
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That's what I was thinking too but the foreman said its not. It doesn't sound like AC servo motor noise but my new S Class had a similar issue and they found out it was the servo arm wasn't lubed from the factory and would make a knocking noise every time the auto air distribution would change.
My plan to leave it with them this week and let them investigate further.