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      05-12-2012, 02:40 PM   #7
Jax543210
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Drives: 2007 Z4 Coupe
Join Date: May 2011
Location: Jacksonville

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Quote:
Originally Posted by trialskid View Post
try switching from vent to recirc and see if it makes the noise. it definitely sounds like a jammed mode door
I can't seem to find a situation where the noise does not occur.

Test results:
vent on (no recirc) = noise
recirc on = noise
HVAC off completely = noise
Auto HVAC on or off (manual) = noise
A/C on or off = noise

The fact that even when the HVAC is off completely the noise occurs is somewhat surprising.