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  #16  
Old 11-11-2012, 01:42 AM
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Quote:
Originally Posted by MBeige View Post
Other sources of leaks:

1. Trunk lid star - 13mm bolt to remove star and inspect.
2. Trunk lid emblems - holes on each side holding down the emblems. Tiny grommets holding emblems in place may have fallen off.
3. Antenna mast seal - there are two, outer and inner.
4. Quarter panel moulding fasteners - if they go bad they can allow moisture inside. There is a maybe 8 or 10mm bolt at the corner of the quarter panel holding this trim piece to the car.
5. Tail light seals and seals under tail light
6. Fuel filler neck seal - allows water into trunk if not sealing properly.
7. Trunk lid "stops" on either side/rear corner of trunk lid

If water gets in and pools, when ambient temps go up the water collects on the inner surface of trunk lid.
Thanks for the tips. They are all thoughtful and useful. I have inspected all the seals, and have placed a little extra silicone sealant around the seals just to make sure. I will also climb in the trunk with a flashlight while the kids use the garden hose and see if I can detect any leaks.

Thanks you guys and I will update when possible.

Packman

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  #17  
Old 11-11-2012, 01:52 AM
MBeige's Avatar
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Location: SoCal
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Be sure to remove the plastic liners on the fender wells when climbing in. This will show leaks coming from the side moulding trim, antenna mast and fuel filler neck.

I forgot to say, check all drains. The spare tire well has its drain hole, as do the fender wells right behind each rear wheel. All 3 should be clear of debris. Poke a screwdriver from the underside to clear the drains out.

Also, the bumper corners have mounting brackets to the fender (Euro versions) or the rubber ends have mounts going into the fender (Euro and US). Since the US have the large rubber covers, I wouldn't worry about them that much, but just the same, inspect for any signs of leakage. The US bumpers use two out of three holes for mounting the cover. The third (middle) hole has a rubber plug. Euro models use only the middle hole. Leaks here can get into the fender well. Coupled with clogged drains, they will pool water.
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  #18  
Old 11-11-2012, 04:14 AM
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Join Date: Oct 2012
Location: Living on a gravel road in a Red State
Posts: 593
The trunk of my car had #3 and #4. It was evident when the plastic panel was removed from sill. It rusted out in the affected areas. I had holes at the bottom under the panels big enough that you could put your fingers through once you put your fingers through the rust.

Every time it got cool it felt like there was moisture evident on the inside surfaces.

Like beige said, the drains were clogged with debris.

,
Quote:
Originally Posted by MBeige View Post
Other sources of leaks:

1. Trunk lid star - 13mm bolt to remove star and inspect.
2. Trunk lid emblems - holes on each side holding down the emblems. Tiny grommets holding emblems in place may have fallen off.
3. Antenna mast seal - there are two, outer and inner.
4. Quarter panel moulding fasteners - if they go bad they can allow moisture inside. There is a 6mm bolt at the corner of the quarter panel holding this trim piece to the car.
5. Tail light seals and seals under tail light
6. Fuel filler neck seal - allows water into trunk if not sealing properly.
7. Trunk lid "stops" on either side/rear corner of trunk lid

If water gets in and pools, when ambient temps go up the water collects on the inner surface of trunk lid.
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  #19  
Old 11-12-2012, 01:25 AM
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Join Date: Mar 2011
Location: Victoria Canada
Posts: 37
Uum, fix your door seals?

I spent dozens of hours chasing down an elusive `leak' in my 126 trunk with the only symptom being heavy condensation in the trunk lid. When you open it up sheets of water flow down the lid into the front corners and now (since I pulled the rubber plugs at the front corners to let it out) into the gutters. Floor and wheel wells are bone-dry.

All four of my doors have seals with splits on the top. When it rains, I see a small amount of water getting into the cabin through these splits. It does not look like much, but I am beginning to think it is enough be bring moisture into the cabin, which then raises the humidity, which then . . . gets into the trunk through the chassis openings behind the back seat.

Unfortunately, it is too cold and wet here now for me to fix the door seals without a big production. I'm going to have to pull the seals out for a few days, bring them inside, clean them up and sika-flex them back together.

If you beat me to it, let me know if this solves the problem.



Quote:
Originally Posted by PackerEdgerton View Post
Hi guys, my 240D is forced to sit outside in the Pacific NW. As we are into Fall and soon Winter, I've noticed that the changes in temp and the moisture in the air causes massive amounts of condensation to form on the inner trunk surface. The floor of the trunk is dry (I've fixed all the leaks from trunk seal and rear window), but the inner surface of the trunk lid has massive amounts of condensation, likely from the combination of moist air and big swings in temperature throughout the day.

What do you guys do to combat or avoid this?

Thanks,

Packman
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  #20  
Old 11-12-2012, 09:02 AM
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Join Date: May 2008
Location: Baltimore, MD
Posts: 2,544
Quote:
Originally Posted by scottmcphee View Post
Baby diapers are also very moisture absorbing maybe pull the absorbent pack out of several set them strategically in the trunk see if the swell up?
This is what I do with backup CDs/DVDs that are stored long term

As for the trunk, some kind of vent is your best bet. My quarters were rusted out and the trunk never had a condensation problem (living in the humid NE)

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