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Old 12-03-2012, 09:53 PM   #12
Registered User
Join Date: May 2012
Location: CT
Posts: 230
My Ride: 2003 330i
Originally Posted by jfoj View Post
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.
jfoj, is this really that common on sedans? If so I'll start there. Ironically in the last two days I started getting condensation on my rear windshield every time I park. I've had the rear windshield replaced several years ago and I've always wondered if they didn't seal it properly or if my vapor barriers are bad. Sometimes I get a lot of condensation back there but I'm not sure if that's because the leak is closer to that part of the car or if (more likely) that it's just always the coldest part of the car and any residual moisture condenses there first. Windshield has a lifetime warranty so I could have them reseal it I suppose. I even get creaking sounds on really cold mornings from the back that I think might be ice forming in some tiny crevices, but it's hard to tell.
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