Car Problem Reports
BMW 530i Heavy rain causes water to collect on rear floor boards
BMW 530i Problem
Average Mileage: 124,000 mi (89,000 mi - 180,000 mi)
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.
Visitor, 2002 BMW 530i, 180,000 mi
Rear driver side floor gets wet in heavy rain, was the vapor barrier.
Visitor, 2002 BMW 530i, 148,000 mi
Rear driver side carpet soaked.
Visitor, 2002 BMW 530i
I had this problem twice: once on each side of the back seat. It was due to faulty plastic seal in the doors.
Visitor, 2002 BMW 530i, 89,000 mi
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!