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Water in trunk plastic storage compartment

Specific discussion about the E89 2009 Z4 (sDrive35is, sDrive35i, sDrive30i, sDrive23i)
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javis20
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Water in trunk plastic storage compartment

Post by javis20 » Thu Nov 05, 2020 5:36 pm

After driving in the rain, I'm seeing water in the left side plastic storage compartment. Anyone know where it might be coming from? The rest of the trunk is completely dry including the battery area.
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mr.tourette
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Water in trunk plastic storage compartment

Post by mr.tourette » Thu Nov 05, 2020 6:19 pm

I had a bit of that, if you're car has updated rear lights (most have the old ones let in water ironically) the new lights have only 2 bolts rather than 3, this leaves a hole in the chassis where the bolt would pass through. I filled said hole with silicone sealant and it now remains mostly dry. Do the other side too as there are a stack of electric gubbins over there. Occasionally after a few days solid rain there may still be a tiny amount of damp in there but its 99.9% drier than it was and almost always bone dry now
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Water in trunk plastic storage compartment

Post by flybobbie » Thu Nov 05, 2020 6:55 pm

Remove the plastic pins, lift the trim out an place tissue paper around and see where it gets wet.

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Water in trunk plastic storage compartment

Post by Alpina 98 » Thu Nov 05, 2020 7:11 pm

I had the same problem. The cause was a leak on the near side rear light cluster. After failed attempts using silicon sealant it was replaced with a secondhand unit. If you look closely into the light cluster you may notice water inside, in which case you should replace it.
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javis20
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Water in trunk plastic storage compartment

Post by javis20 » Fri Nov 06, 2020 1:12 pm

Thanks all, I didn't even think of the light cluster, I'll check it out today.

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Water in trunk plastic storage compartment

Post by Chippie » Fri Nov 06, 2020 6:09 pm

I had the exact same problem in mine, I removed the rubber trim around the top edge of the boot opening where the hinges are, removed all the old sealant and replaced it with some black silicone, no more water
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javis20
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Water in trunk plastic storage compartment

Post by javis20 » Sun Nov 08, 2020 4:04 pm

I just washed the car and couldn't reproduce the water leak. I'm thinking it might happen when the car is in motion.

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Water in trunk plastic storage compartment

Post by javis20 » Tue Nov 17, 2020 8:44 pm

Car sat overnight and I got water again. Must be as others said, light cluster or rubber mouldings.

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Water in trunk plastic storage compartment

Post by clarker63 » Tue Nov 17, 2020 10:30 pm

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javis20 wrote: Tue Nov 17, 2020 8:44 pm rubber mouldings
you can tell if its these if the rubber strip is wet on the top/sides..

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Water in trunk plastic storage compartment

Post by javis20 » Mon Nov 30, 2020 8:42 pm

Yep, rubber seal. Unfortunately it cost a ridiculous price. Over $230... I circled the drip.
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javis20
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Water in trunk plastic storage compartment

Post by javis20 » Wed Dec 02, 2020 1:21 pm

Looks like the weather strip ripped on the outside edge, in the area shown in clarker63's picture. I believe the tear causes it to loose it's firmness and seal. I'm going to try inserting a foam dowel inside the weatherstrip in that area. Worth a try, a lot cheaper than replacing the whole weatherstrip.

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Water in trunk plastic storage compartment

Post by clarker63 » Wed Dec 02, 2020 1:44 pm

javis20 wrote: Wed Dec 02, 2020 1:21 pm Looks like the weather strip ripped on the outside edge, in the area shown in clarker63's picture. I believe the tear causes it to loose it's firmness and seal. I'm going to try inserting a foam dowel inside the weatherstrip in that area. Worth a try, a lot cheaper than replacing the whole weatherstrip.
not ripped on mine, failure of the sealant on the flat part of the seal just out of shot, kept on with two bolts was my issue.

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Water in trunk plastic storage compartment

Post by javis20 » Wed Dec 02, 2020 3:10 pm

I'll double check that area.

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Water in trunk plastic storage compartment

Post by javis20 » Sun Jun 13, 2021 1:44 pm

Just follow-up... I found a used rubber lower seal on ebay for $40. It looks almost new. Planning to install it later this week.

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