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

Problem Description

(48 people reported this problem)

BMW 530i Vehicles With This Problem

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Viewing 1-20 of 27 comments
My rear floor mats are soaked and started to mold! How much does it cost to fix this problem?

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.

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!

2003 BMW 530i 75,000 mi,
During heavy rain, some water collected at the rear driver side. I dont know how to fix it. But it bothers me.

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 530i 110,000 mi,
collect behind the driver's seat....not sure if seal in sun roof is compromised or back door, or plugs blocked...

2002 BMW 530i 148,000 mi,
Rear driver side carpet soaked.

2004 BMW 530i 140,000 mi,
In heavy rain, water is pooling on passenger side floor. We have not determined cause.

2004 BMW 530i 160,000 mi,
When it rains water collects in the rear passager door of my car. It is a large amount and it can be heard in the door. The car now has a mildew smell.

2006 BMW 530i 102,000 mi,
Out of the blue water collect in passenger side rear floorboard. Still cant identify where it is coming from.

2001 BMW 530i 69,000 mi,
Passenger rear floor wet after the rain. No idea where is water coming from. Checked the bottom by lifting the car, find no seal leaking. No idea and how to fix it. Seems like a manufacturing issue with beamers.

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.

2002 BMW 530i 79,000 mi,

2007 BMW 530i 47,000 mi,
Just realized it it rained hard last night and rear floor is soaked smh 2011 BMW 535i

2002 BMW 530i 180,000 mi,
Rear driver side floor gets wet in heavy rain, was the vapor barrier.

I had this problem twice: once on each side of the back seat. It was due to faulty plastic seal in the doors.

I still the problem. I keep my car inside my garage when it rains.
It started on last year winter 2015. The rear driver side got 2" of water. Didn't fix it yet!!!

2007 BMW 530i 130,000 mi,
All of the seals needed replacing. Fault of water leak is design flaw in the sunroof seal that deteriorated causing water to flow into the back of the car. 4 inches of standing water! Cost was $1200.

2002 BMW 530i 95,000 mi,
Back drivers side floor board wet when raining.

2004 BMW 530i 75,000 mi,
Same problem with water on rear floor boards.