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      07-11-2021, 10:31 PM   #1
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rusted tools-->wet area behind battery bay where roof hydraulic pump is

EDIT:
So I found out the cause of the corroded tools was cuz the toolkit was sitting on some stagnant water trapped in the area behind the battery bay at the bottom of the trunk. I guess it's from sitting outside when it rains and somehow water is leaking in: the rest of the trunk is not wet so I think it may be seeping in behind the panels. Any help where and how I can plug up all the potential prb areas? I didn't see any damage in the seals lining the trunk lid.




(original)
So I checked my toolkit which is always stored in usual place in the trunk underneath the floor panel/near the battery and I guess it rusted due to accumulating some condensation? over the winter? Just wondering what can be done to fix it/make it look better?
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Last edited by tranquility; 10-12-2021 at 08:40 PM..
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      07-12-2021, 05:29 AM   #2
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Buy new ones from dealer?

Shouldnt be expensive.. for sure cheaper than to sandblast and paint the old ones...

http://bmwfans.info/parts-catalog/E8...ack/#7184971_2


Moisture does corrode stuff in the boot... when you open it while raining it rains in and so on...

Years ago i had an issue where my third brake light on the boot lid had 3 of its right side LED-s constantly on... while driving and while parked all night.
Electrician found that bootlid harness plug connectors had corroded and voltage was somehow arking to the brakelight wiring, enough to light up 3 led-s but not the whole brake light. Cleaned the connectors and has been working perfectly since. Plug connection is under the boot floor in the rear side of the car... right where rain can get easily in when lid is opened.
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      09-19-2021, 02:59 PM   #3
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Ok, as an update, I found out that the base of my trunk has been holding some water and it's still there even though it's summer! So that's why my tools have been rusted or whatever. Is the trunk some sort of freaking insulator cuz the water retention is off-the-charts!

Anyway, I've been stuffing napkins in the hole where the toolkit goes (next to the battery) and have been constantly changing out new ones since the water is non-stop! I know that some snow might've fell into the trunk during the past winter but still, seems like a crazy amount of water. Any better solution or suggestions, I dunno how comfortable I feel about removing stuff from/disassembling the trunk.

Knock wood, luckily besides the rusted tools, I don't think any other damage has occurred, but should I be on the lookout for something?
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      09-20-2021, 12:36 AM   #4
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This problem has been discussed on the other forum.
When you lift the boot, the rubber seal that runs across the back, the ends have bits of rubber held down by screws. The sealant under those can dry out and allow water in boot. BMW use some kind of mastic that looks like chewing gum.
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      09-20-2021, 03:46 AM   #5
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Quote:
Originally Posted by bigendbob View Post
This problem has been discussed on the other forum.
When you lift the boot, the rubber seal that runs across the back, the ends have bits of rubber held down by screws. The sealant under those can dry out and allow water in boot. BMW use some kind of mastic that looks like chewing gum.
Is this the thread?
https://e89.zpost.com/forums/showthr...water+in+trunk

I'll need to ask them there. Tx.
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      09-24-2021, 03:19 PM   #6
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So I found out the cause was that the toolkit was sitting on some stagnant water trapped in area behind the battery bay at the bottom of the trunk. I guess it's from sitting outside when it rains and somehow water is leaking in: the rest of the trunk is not wet so I think it may be seeping in behind the panels. Any help where and how I can plug up all the potential prb areas? I didn't see any damage in the seals lining the trunk lid.
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Last edited by tranquility; 09-25-2021 at 01:53 PM..
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      09-25-2021, 01:53 PM   #7
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Bump to see if any help.
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      09-25-2021, 02:24 PM   #8
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https://z4-forum.com/forum/viewtopic.php?t=77478
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      09-27-2021, 05:46 PM   #9
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Quote:
Originally Posted by bigendbob View Post
Tx for the link. I read through all of it but unfortunately only got some clues, some of the pix don't show up and there seems to be many pts of entry where the water could come in.

Anyway, I put some towels to hopefully find out where the water is coming from.

I'm surprised no one else on this board has this prb and can give pointers, darn.

What a stupid design, how hard can it be to keep water out, esp in such a hidden space? That's just asking for trouble, not to mention the ppl bringing up this prb to the techs and they still can't figure it out. Guess this really is a diy/'if you want something done right, gotta do it yourself' kinda deals.
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      09-28-2021, 05:15 AM   #10
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I actually went and inspected my trunk because of this thread... car stood in the rain for a couple of days aswell giving enough of opportunity for the water to get in.... but nothing... Mine is totally dry which is suprising as my car is rather old early production from 09... would think that seals would start to go, give away and so on.
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Last edited by KennyP; 09-28-2021 at 05:31 PM..
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      09-28-2021, 12:07 PM   #11
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Quote:
Originally Posted by KennyP View Post
I actually went and inspected my trunk because of this thread... car stood in the rain for a couple of days aswell giving enough of opportunity for the water to get in.... but nothing... Mine is totally dry which is suprising as my car is rather old early prodution from 09... would think that seals would start go give away and so on.
That's the thing, this prb is kinda misleading because it supposedly takes a MASSIVE downpour for the water to seep in. A reg rainfall supposedly is ok, not to mention when techs were told of this specific prb, they went about their sleuthing and presumably started spraying and still couldn't find the prb area themselves.
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      10-12-2021, 08:46 PM   #12
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So I tested for where the water could be coming in, lining the hydraulic pump area w different cloths and the blue ones were dry but the yellow ones which are facing the back of the car were moist, so I believe water is coming in from the rearlight casing thereabouts.

The annoying thing is BMW probably knew this was a potential prb since the pump is elevated a bit from the floor so unless the water accumulation is really high, it shouldn't touch and mess w the electrical or whatnot. Still, it's worrying now that I finally know about this issue, but luckily it never affected the car in any way *knock wood*.

Any ideas what to do? In the meantime I'm just putting cloths touching the floor to soak up and wring it everytime it gets wet.
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