E46 vapor barrier door fix

How to reseal a faulty vapor barrier. The symptoms of a bad vapor barrier are wet carpets underneath the dash of the car after rain showers. This was done on a 2001 330i.

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Removing BMW Door Panel & Replacing Window Regulator
Is your BMW's window not operating properly? In this detailed video, Bavarian Otto shows you -- step by step -- how to remove the door panel and window, and how to replace a faulty or broken window regulator, saving you hundreds of dollars over what a dealer would charge for the repair. You can find the BMW window regulator you need at http://www.bavauto.com/ Have a tech question about your BMW or MINI? Find the answer at http://blog.bavauto.com/

Testing Vapor Barriers BMW
This is how you can test the seal of the vapor barriers on the rear doors of BMWs. This video is filmed on an E39. After I removed the door panel, I poured three bottles of water back to back at this rate. When I checked under my barrier it was letting a small amount of water seep through. If I had used a hose and blasted the side of the car it would have been a lot worse. You can find a DIY for fixing this problem here: http://www.louv.tv/cars/m5/leakydoor/leakydoor.html

BMW Excluservice Vapor Barrier Water Leak Part 2
Part 2 of the water leak repair on a customers E39 2002 BMW 5 series.

BMW door panel water leak fix
E39 (E46 has same issue) the interior door liner has been trimed to "flash" water (just like a good roofer would do a roof on a house) causing it to leak as normal to the inside of the door so it can leak out of the door drain holes. It's normal for water to leak into doors, it just needs to drain out of the normal drain holes on the bottom outer edge of the door. You can also just reglue the liner. This is just one of several ways to repair the water leak.