BMW F10 rear door and rear footwell water leak
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Why does water get into the F10/F11's rear footwell from the door?
The most common cause is the glue of the moisture barrier (vapour barrier) inside the door coming loose. The water is then not directed to the drain hole at the bottom edge of the door but runs to the wrong side of the seal and wets the carpet. It is a common fault and can occur on either side.
How is the moisture barrier repaired?
The door card is removed and the old barrier is lifted off. The glue area is cleaned of sand, and new butyl rubber tape is fitted and heated with a hot air gun so that it sticks. At the same time the door card clips and the opening cable mounting are checked.
Can water come from somewhere other than the moisture barrier?
Yes. Water can also get in through the seal of the door lock housing. A rear window washer fluid leak can be caused by a fault in the connector or hose between the hinge and the rear speaker.
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