Heavy rain causes water to collect on rear floor boards on BMW 530i

Average mileage: 121,062 (30,000–250,000)
5 model years affected: 2002, 2003, 2004, 2006, more2007
22 people reported this problem
12 people shared problem details
During a heavy or prolonged rain (or carwash) water collects on the rear interior floor boards. There appear to be two major causes for this - mine had the more frequent of the two. One is that the sunroof drains can get clogged. The drains run down the c-pillars just behind the rear doors and if clogged the water backs up and runs down onto the floors. The other, more frequent issue is a torn or unglued noise baffle/vapor barrier that is in each rear door. Rain water goes down inside the door at the bottom of the glass and that vapor barrier directs the water flow to a drain at the bottom-front of the door. The glue/sealant that holds that barrier to the door frame can go bad - when that happens the water goes inside the car rather than down the drain. Re-seal the barrier and the problem goes away. Be careful to do research, or take it to a pro if you have rear door airbags - if they deploy while your head is in front of the door it can kill you. For a car w/o airbags like mine - it took me about 20 minutes for each rear door to remove the door panel and put new sealant on the barrier.
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I had this problem twice: once on each side of the back seat. It was due to faulty plastic seal in the doors.
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I live in socal so we don't get much rain but when it does i know to keep the car in the garage which is very annoying. Otherwise, the floor boards get drenched with water build up from the cheap rubber seals along the rear doors go bad quickly.
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2002 BMW 530i180,000
Rear driver side floor gets wet in heavy rain, was the vapor barrier.
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2002 BMW 530i30,000
The flooded rear occurred several times. The dealer had to replace the vapor barriers several times. The last time, they tried to charge me for their work!!!
2004 BMW 530i75,000
Same problem with water on rear floor boards.
Started a month ago with water collecting on the rear driver side floor board. Very heavy rain last night and I have 2-3 inches on the rear floor board. Very disturbing
2003 BMW 530i110,000
collect behind the driver's seat....not sure if seal in sun roof is compromised or back door, or plugs blocked...
2003 BMW 530i120,000
gonna pull the interior rear door covers off and look at the seal
after washing the car or when it rains. water will collect in the bottom of the door frames
2002 BMW 530i148,000
Rear driver side carpet soaked.
2002 BMW 530i89,000
I just purchased my 2002 BMW 530i, and just realized the problem! When there is heavy rain, the floor in the back gets saturated! I have no idea how to fix this!
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