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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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Old 01-15-2013, 07:11 PM
computerwhiz1 computerwhiz1 is offline
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Location: Birmingham, Alabama
Join Date: Mar 2011
Posts: 195
Mein Auto: 2000 323i
Still having leaky doors. What to seal with?

I have redone all 4 doors vapor barrier seals twice now. I used the 3M window-weld in a roll which is exactly what the dealership told me to use. Apparently its what they use to do the job as well. The first time I redid the seals they leaked and I assumed that it was because I hadn't pressed down hard enough to obtain a good seal. So this most recent time I used a small paint roller to roll over the fresh bead of window-weld on each door to be sure that I got a good seal. I checked each of the vapor barriers right after resealing them and all of the seals looked good and held when I tugged on them even moderately. I thought that surely I had solved the problem. Not so! The doors have now leaked again, all four of them. It has rained here in the south-east for about the past 7 days straight so I have some pretty soggy floor boards on all four corners. I am going to reseal them again this weekend using silicone sealant as I am about 99% sure it will work. I will just loose the ability to simply pull the vapor barrier off if I need to get under it at a later date. Does anyone have any other suggestions as to what to use before I use the silicone sealant? I am sure it is the vapor barriers as I have taken the door panels off and watched the water run out from behind the vapor barrier and into the car where the vapor barrier has pulled away from the bottom part of the door.

This is another example of the pathetic engineering done by BMW for this supposedly "luxury" car IMHO. Sorry about the rant, i'm just tired of fixing things that shouldn't be an issue in the first place.
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