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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > Water in Back Seat Floor Boards



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      09-09-2010, 07:33 AM   #1
richjamison
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Water in Back Seat Floor Boards

2007 328i

So it has been raining for the past few days here in Oklahoma. I have noticed that my floor boards in the backseat are wet. There is no obvious source of where the water is coming from (ie leaky door seal). Is it possible that the water could be coming from the undercarriage somehow? Has anyone else experienced this. The windshield top cover (rubber piece at the top of the windshield) is deteriorating and needs to be replaced. I am not sure if this could be introducing water into the frame of the car and somehow traveling to the backseat. Any advice?

Respectfully,

Rich Jamison
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      09-09-2010, 07:50 AM   #2
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The most common causes of wet floorboards are clogged moonroof drains or clogged underhood vents (by the bottom of the windshield.
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      09-09-2010, 09:10 AM   #3
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^^ Do not forget Vapor Barrier seals leaking as well.

And with NO source I bet $100 its a Vapor barrier issue covered under BMW Warranty.
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      09-09-2010, 10:03 AM   #4
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Quote:
Originally Posted by MrDummy View Post
^^ Do not forget Vapor Barrier seals leaking as well.

And with NO source I bet $100 its a Vapor barrier issue covered under BMW Warranty.
Agreed happened to me in my last BMW.
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      09-09-2010, 04:07 PM   #5
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Quote:
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^^ Do not forget Vapor Barrier seals leaking as well.

And with NO source I bet $100 its a Vapor barrier issue covered under BMW Warranty.
+1, I would almost garuantee it is the vapor barriers. Take the rear door panels off and see if the foam piece is firmly glued to the door. It almost definately is not.
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      09-09-2010, 04:21 PM   #6
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Quote:
Originally Posted by Barbera335 View Post
+1, I would almost garuantee it is the vapor barriers. Take the rear door panels off and see if the foam piece is firmly glued to the door. It almost definately is not.
No, no and NO.

If the car is under warranty then do NOT try to fix it yourself.

Any attempt to fix it yourseld will (should) result in the dealership denying warranty service as they can then blame any problems on a botched repair attempt.
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      09-10-2010, 05:58 AM   #7
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^^^ true that, if it is not under warranty then DIY using Butyl tape.
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      09-10-2010, 12:08 PM   #8
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OK, so i was feeling around under the seats and discovered the AC floor vents. The floor boards have dried but I noticed a slight dampness around the passenger side floor vent. I appreciate everyones feedback so far, but is there any chance that the AC could be producing condensation and spewing it out onto the back floor boards?
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      09-10-2010, 06:44 PM   #9
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Doubtful, I'm almost 100% positive it is your door vapor barriers. You will have to remove the rear door panels and inspect.
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      09-10-2010, 09:22 PM   #10
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It is seeping in from your windshield. You need to get the gasket and the frame seal repaired and the windshield reseated. It is a half hour job. Otherwise you will have endless electrical problems.
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      09-10-2010, 09:41 PM   #11
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No trunk water, in the lower area, near the amplifiers?
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      09-11-2010, 09:23 AM   #12
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+ for the vapor barrier, had same on 2002 coupe... close the windows open the doors run water from a hose overth outside of the window and see if water leaks from the bottom of the door if so remove door panel ,install new b.tape also I found the door panel clips at the bottom half didn't have the rubber seals on them so even if the vapor barrier is good(not messed with )check the clips for rubber seals that was my problem on one of the doors(both were leaking)
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      09-11-2010, 03:49 PM   #13
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I have what looks like a water stain/residue on the passenger side C-pillar headliner. Vapor barrier, or..??
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      09-11-2010, 03:55 PM   #14
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Yes it could be your a/c! My e92 had an issue where the front floorboards would literally flood from a/c condensation. I would get into the car and it would smell absolutely awful. Took three trips to the dealer to "find" the service bulletin. It is a duct that runs in front of the gear shifter under the center console. I had to pull up most of the carpet in the car and use damp-rid to get the water out. It was a total nightmare and I thought that the smell would never go away but once they completed the repair and the carpet dried out I no longer have any smell.
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      09-11-2010, 06:11 PM   #15
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It's a known problem that the windshield cowl shrinks and leaks onto the AC blower....usually the passenger side foot well area is affected but I guess it's possible for the rear foot well areas to be affected as well.

Is your AC blower squeaking at all? The metal in the blower will rust with exposure to moisture and it will eventually fail. Not sure if there is a SIB out for this.
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      09-11-2010, 06:21 PM   #16
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If you're in warranty, take your car to the dealer and ask them to inspect the vapor barriers. If not, you can DIY as mentioned above.
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      09-12-2010, 08:48 PM   #17
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I had this happen on my '85 VW GTI when I was in college. The culprit was a bad seal on the passenger-side door. Check and see if it's at all damp at the bottom of the door trim.

It was a crappy (but wonderful) car so I drilled a hole in the floor bed as a drain.

Problem solved...probably not recommended for your 3'er.
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      09-12-2010, 11:28 PM   #18
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Quote:
Originally Posted by IancoleTX View Post
I have what looks like a water stain/residue on the passenger side C-pillar headliner. Vapor barrier, or..??
Sounds like a clogged or improperly installed sunroof drain.
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      09-13-2010, 12:37 AM   #19
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Quote:
Originally Posted by kurtural View Post
It is seeping in from your windshield. You need to get the gasket and the frame seal repaired and the windshield reseated. It is a half hour job. Otherwise you will have endless electrical problems.
No offense man, but before you say anything you should read the OP's post first. He specifically said that the water on his REAR floor. How is it even possible for the windshield to be the cause of the problem when it is in the front of the car?
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      09-13-2010, 04:56 AM   #20
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If you are still under warranty, go to the dealer ASAP!
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      09-13-2010, 05:46 AM   #21
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Quote:
Originally Posted by ********* View Post
It's a known problem that the windshield cowl shrinks and leaks onto the AC blower....usually the passenger side foot well area is affected but I guess it's possible for the rear foot well areas to be affected as well.

Is your AC blower squeaking at all? The metal in the blower will rust with exposure to moisture and it will eventually fail. Not sure if there is a SIB out for this.

No sib for motor I ihave cowl issue still and had to pay for blower motor replacement myself, well the $50 cpo fee
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      09-13-2010, 11:59 AM   #22
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I had the same problem in my 2006 E60, it ended up being the seal around the sunroof. I replaced the seal and sunroof mostly through insurance and out of pocket. Also I pulled my carpet up and found almost 2 inches of water which ended up damaging all the electronics under the passenger seat. I took pictures and pulled the drain plugs since bmw puts a lot of electronics under the floor boards which end up to be very costly to fix if they get wet. Months later the water came in again so I sold the car since BMW couldn't find the issue this time around. Check the drains in the sunroof and under your hood by shooting compressed air through them if they are clogged it will drain behind your front tires and in front of your back tires mind you if BMW finds them clogged they will not cover the cost since cleaning them is the sole responsibility of the owner. Also check your trunk in the storage area where a spare tire would normally go, water could get in there from the drains...
Good luck with your outcome.
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