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      09-13-2012, 02:19 PM   #25
thekurgan
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Drives: E90M3
Join Date: Aug 2007
Location: Sacramento

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2008 BMW M3  [0.00]
Quote:
Originally Posted by Jstic View Post
Ok, I've got the noise isolated. It is the fresh air actuator/servo motor that is causing the noise, and appears to be slipping or malfunctioning. Just like the post above where the indy diagnosed it as broken gears, mine has slipping gears. I can actually see what is happening when I get on my back and look under passenger side dash after taking off access panel. My wife turned the ignition key to generate the noise and I was watching under the dash. I've removed the stepper motor and will have it checked out. I'll post back with pictures and a final fix when I have it repaired. Hardest part so far was having to remove the front seat so I could lay on my back and get access.
That is a PITA, and those rail bolts are "supposed" to be replaced each time they're used, according to the TIS.
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