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Check the under car for missing plastic trivet

It was the cause on my E39 for wet carpet


Photos and post

Re: water on floor rear passanger

On this issue beware if you have airbags in the back door ........can't remember if they do have in the back door and as it is pouring rain outside I can't go out and have a look right now ! Sorry..............KennygDownunder

Re: water on floor rear passanger

Be sure to check the drainage of your sunroof also as this is often a source of mysterious water after rain especially after having been stationary in that rain for example overnight !.........my 10 Cents(inflation)GOOD LUCK and can you let us all know on this forum when you find out the problem ?

Re: water on floor rear passanger

Hey there,

I just bought a '03 530 with the same problem and I was told to check the rear door seal ( have to test with water ) or the inside liner behind the door panel may not may have gaps in the seeal, thus letting water run through into the interior floor. You have to take off the door panel and make sure there are no breaks in the gasket for the door liner...you'll need a silicone caulk or something similar to seal the gaps. This is what I've learned from looking over both E39 boards.

Good luck !

Re: water on floor rear passanger

any help out there

water on floor rear passanger

in need of desperate help.o2 m5 25k miles.moved out in the woods a year ago.last fall with the car outside the floor started getting wet when it rains.a lot of water gathers on passanger floor.poured water on the door and i see no signs of any leak.please help asap.thanks