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I'm currently chasing something I thought was drive train noise on my wife's 328xi (also the N52). But....it goes away when I turn off the AC, which was a surprise-- so it at least appears the clutch on the compressor is effective.
Go ahead and try turning the AC switch on and off and see if it makes a difference.
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 2007 3.0si Coupe
Dinan Stage I Suspension (Shocks, Struts, Springs), Ground Control Front Camber Plates, Treehouse Racing Front Control Arm Bushings, RTAB Bushing Limiters |