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Old 12-02-2018, 09:24 PM
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Join Date: Jun 2017
Location: NE GA
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Chasing Water Leaks Today

I recently bought my 16 year old daughter a 2007 X3 w/approx. 117,000 miles on it. It seems to be a pretty good car except for interior water leaks. About the second time I filled the washer reservoir within a week, I read where the rear window line runs under the console and can separate, leaking washer fluid into the carpet after I found the rear floors soaking wet. Promptly unplugged the line from the pump, plugged the pump and removed the wire plug - will fix it later. Thought all was well until the first rain a few days later. Found more water on the rear floors. I've been wet-vacuuming them for the last few weeks until today. You will be surprised how much water one can vacuum from the floor mat anchor holes! Today I started at the sunroof drains verifying they drained. I blew low pressure compressed air from the bottom up. The rears I wound up cutting them open behind the corner cargo covers then blowing air both ways before splicing them back with fuel line that had the same ID as the OD of the drain tubes. Then poured water from a bottle slowly from the top corners of the sunroof to verify drainage. Next I removed all 4 door panels. The rear vapor barriers had been "molested" (torn) and all 4 had some non-sticking spots. I used 2" wide HVAC foil tape to carefully seal all the edges of the vapor barriers all the way around. Then sprayed a garden hose at each window one at a time, opening the door and checking for leaks. The fronts did fine the first go round. The rears were more challenging. The biggest leak was from the nut of the bottom of the window regulator! I took both nuts off and sealed them with black RTV silicone, tightened them back, then put a bead around them again after taping. There were also some tiny leaks from around the foil tape joints which required more taping. I eventually got them both sealed. I used this method to successfully repair and seal the more severely torn vapor barriers on my 02 X5. I find it hard to believe premium segment vehicles such as my X3 & X5 would have these kinds of issues and hack mechanics don't help matters either! I'll have a week to dry the carpet out before next weekend's forecasted rain.
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Current Rides:
'88 635 CSI (mine)
'02 X5 3.0 ("tank thing")
'01 325CI Convertible (wife's)
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'07 X3 3.0 SAV (other daughter's)
Guess who gets to work on them!
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  #2  
Old 12-03-2018, 01:21 AM
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Join Date: Jun 2014
Location: Omaha, NE
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cn90 is on a distinguished road
- If you have to park the car outside and have to leave town, a GHETTO solution (temp fix until you have time to tackle the problem) is:

- Get Clear Plastic Vapor Barrier (the stuff at Home Depot), usually used to line basement floor before pouring concrete. This is thick plastic.

- Cut a piece a bit longer than the door, then place it so that it covers the bottom half of the door. Tape using painter tape, just tape below the arm rest.
Then close the door.

- This plastic thing will divert any water to the outside world until you have time to fix it permanently.

- If the Door VB is torn, get a new one from dealer.
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Old 12-04-2018, 09:14 PM
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Join Date: Jun 2017
Location: NE GA
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shark88 is on a distinguished road
Quote:
Originally Posted by cn90 View Post
- If you have to park the car outside and have to leave town, a GHETTO solution (temp fix until you have time to tackle the problem) is:

- Get Clear Plastic Vapor Barrier (the stuff at Home Depot), usually used to line basement floor before pouring concrete. This is thick plastic.

- Cut a piece a bit longer than the door, then place it so that it covers the bottom half of the door. Tape using painter tape, just tape below the arm rest.
Then close the door.

- This plastic thing will divert any water to the outside world until you have time to fix it permanently.

- If the Door VB is torn, get a new one from dealer.
Good idea for a temporary fix! I did use some black plastic vapor barrier as a permanent fix on my X5. I had one OEM barrier that was so torn by PO that it was all I could do to use the pieces for a template. I wonder why BMW doesn't tuck the bottom edges back into the door cavity to positively deflect water back to the bottom door drains?
__________________
Current Rides:
'88 635 CSI (mine)
'02 X5 3.0 ("tank thing")
'01 325CI Convertible (wife's)
'06 325i Sedan (daughter's)
'07 X3 3.0 SAV (other daughter's)
Guess who gets to work on them!
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