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Old 12-02-2012, 05:00 AM   #6
jfoj
Registered User
 
Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 10,074
My Ride: '06 330CiC, '03 M5
You likely have moisture getting in the car somewhere.

Check the floor carpet for dampness.

Search sunroof drain (assuming you have a sunroof) and door vapor barrier.

If you have a 4 door car it is HIGHLY likely your rear door vapor barrier(s) is(are) leaking. The rear door vapor barriers AUTOMATICALLY leak after 6-7 years.

The front door vapor barriers can leak, but not as often.

Also if you have had any work inside the doors, this is a likely place to check for leaks as well.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
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