I started getting some water on my passenger side floor after a rain in my 2005 BMW 325i. It seems this is caused by a damaged vapor barrier seal on the door. Water rides down the glass into the interior or the door frame. The vapor barrier forces this water to drain out the bottom of the door and safely away from the interior of the car. When this vapor barrier comes loose from the sheet metal, the water ends up on your floor. To fix, I had to remove the interior door panel and affix it back. The dealer recommended 3M ribbon seal to do this, but they said they couldn't sell it to me. I ended up using some roofing seal from Home Depot that looked like it was about the same thing. Just in case, I put some water proof metal tape over the outside of the barrier. Hopefully it holds. I'll keep this blog updated with the results.
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