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Old 03-02-2018, 07:11 AM
bmw one bmw one is offline
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Rear sunroof drainage repair

For anyone who has seen a water in the trunk, the rear sunroof drainage tube may be disconnected.

Symptoms:

Water puddle under spare tire (i had about an inch because it rained hard)
Water dripping at right rear shock
No water on pillar or pillar surface will not be wet

Steps to solve problem:

1. Remove C pillar (there is 1 torx bolt located behind the light)- there are many diy's on how to remove it. Just be gentle when removing the light and popping the cover off. When I removed the cover, the inner foam pad was drenched.

2. Head liner does not have to be removed. I simply pulled on the rear and the side of the headliner to expose the drainage tube. You'll have to be extra careful not to overbend the headliner otherwise it will rip. Just bend it enough to put your hand in it.

3. Drainage tube is located near the rear coat hook on a coupe. It is very hard to see just sitting in the rear seat. You'll have to lift and tilt your head even then you'll only have about 3 inches of space to view the disconnected hose. Try to avoid prying on headliner when viewing, otherwise it will rip.

4. Join the rubber drainage tube to the frame with zip ties. I ended up zip tying both connections. (attached pic)

5. Put everything back together.

Overall it isn't too hard to access and should be a half hour job if you take your time.
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  #2  
Old 03-02-2018, 03:18 PM
Fast Bob's Avatar
Fast Bob Fast Bob is offline
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Quote:
Originally Posted by bmw one View Post
For anyone who has seen a water in the trunk, the rear sunroof drainage tube may be disconnected.

Symptoms:

Water puddle under spare tire (i had about an inch because it rained hard)
Water dripping at right rear shock
No water on pillar or pillar surface will not be wet

Steps to solve problem:

1. Remove C pillar (there is 1 torx bolt located behind the light)- there are many diy's on how to remove it. Just be gentle when removing the light and popping the cover off. When I removed the cover, the inner foam pad was drenched.

2. Head liner does not have to be removed. I simply pulled on the rear and the side of the headliner to expose the
drainage tube. You'll have to be extra careful not to overbend the headliner otherwise it will rip. Just bend it enough to put your hand in it.


3. Drainage tube is located near the rear coat hook on a coupe. It is very hard to see just sitting in the rear seat. You'll have to lift and tilt your head even then you'll only have about 3 inches of space to view the disconnected hose. Try to avoid prying on headliner when viewing, otherwise it will rip.


4. Join the rubber drainage tube to the frame with zip ties. I ended up zip tying both connections. (attached pic)

5. Put everything back together.

Overall it isn't too hard to access and should be a half hour job if you take your time.
Excellent diagnosis and repair ! Thanks for sharing

This one deserves to be Stickied....consider it done !
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Last edited by Fast Bob; 03-02-2018 at 03:21 PM.
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