GL Class (X164) 2007-2012: GL320CDI, GL420CDI, GL450, GL550

Gl350 battery compartment fills with water

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Old Jan 9, 2023 | 01:22 PM
  #26  
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'08 GL 320 CDI
Originally Posted by Waspjr
hahaha how do I know you have kids!!
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Old Jan 10, 2023 | 03:40 PM
  #27  
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Gl350 x164 Silverado HD f350 wakesetter
Well I had the headliner down I check the sunroof drains for debris and they where all clear and clean.
the drains are all in great shape as well.
does anyone know what’s under the drivers seat by chance ?
also saw some moisture at the taillights so I will address that.
mid I get this thing running again I will probably be driving it for a while exposed lol
cheers thanks everyone for the tips
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Old Jan 10, 2023 | 11:32 PM
  #28  
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Benz: 560 SEC, 2011 GL550 and other brands
Central gateway module, power amp (IIRC its the lowest mounted module), couple ground points, and one other module (cant remebr what its called right now)

Originally Posted by Waspjr
Well I had the headliner down I check the sunroof drains for debris and they where all clear and clean.
the drains are all in great shape as well.
does anyone know what’s under the drivers seat by chance ?
also saw some moisture at the taillights so I will address that.
mid I get this thing running again I will probably be driving it for a while exposed lol
cheers thanks everyone for the tips
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Old Jan 11, 2023 | 01:25 AM
  #29  
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Gl350 x164 Silverado HD f350 wakesetter
Originally Posted by Greg5OH
Central gateway module, power amp (IIRC its the lowest mounted module), couple ground points, and one other module (cant remebr what its called right now)
ok so definitely pull that seat and check.
I haven’t seen any moisture coming from the front. The drains seemed to be all clear as well. I guess coming from rear and flooding forward.
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Old Jan 11, 2023 | 08:30 AM
  #30  
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From: Allentown, PA
'08 GL 320 CDI
Originally Posted by Waspjr
ok so definitely pull that seat and check.
I haven’t seen any moisture coming from the front. The drains seemed to be all clear as well. I guess coming from rear and flooding forward.
The couple times that I've had the passenger side floor opened up, I don't recall there being a way for water from the rear (behind second row) to make it's way to the front. But honestly, I didn't look that closely - it sounds like you've got things still opened up so you'd know better than me!

Did you try pouring some water into each sunroof drain to make sure it all drains out under the car? Pour a good amount into each.

That's a good idea to drive around with things opened up.
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Old Jan 11, 2023 | 10:18 AM
  #31  
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Gl350 x164 Silverado HD f350 wakesetter
Originally Posted by DennisG01
The couple times that I've had the passenger side floor opened up, I don't recall there being a way for water from the rear (behind second row) to make it's way to the front. But honestly, I didn't look that closely - it sounds like you've got things still opened up so you'd know better than me!

Did you try pouring some water into each sunroof drain to make sure it all drains out under the car? Pour a good amount into each.

That's a good idea to drive around with things opened up.
ok I have been separating all the modules and plugs and cleaning them and hen acf50 them.
ultrasonic cleaned the modules as well.
I had the headliner down and inspected there while it was raining and couldn’t see and moisture also I just did a visual inspection of the white boxes(drain basin) at the sunroof and followed the tubing along it all looks good but I have it on my list next time I apply power to functionally inspect the drains. For sun roof
Also started sealing up some of the roof rack feet.
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Old Jan 12, 2023 | 10:45 AM
  #32  
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Gl350 x164 Silverado HD f350 wakesetter
Checked this morning and it’s still dripping from roof rack so I will remove that tonight and tape holes and see if I still get water coming in.
also got the drivers seat off and it has water underneath doesn’t look like any damage there but I will still take apart acf50 and treat it anyways.
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Old Jan 12, 2023 | 10:56 AM
  #33  
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if OEM gaskets are ot available, use an RV sealant, they stick far better and don't shrink. Something like sikaflex 2xx or ProFlex RV

Originally Posted by Waspjr
Checked this morning and it’s still dripping from roof rack so I will remove that tonight and tape holes and see if I still get water coming in.
also got the drivers seat off and it has water underneath doesn’t look like any damage there but I will still take apart acf50 and treat it anyways.
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Old Jan 12, 2023 | 11:27 AM
  #34  
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Gl350 x164 Silverado HD f350 wakesetter
Originally Posted by Greg5OH
if OEM gaskets are ot available, use an RV sealant, they stick far better and don't shrink. Something like sikaflex 2xx or ProFlex RV
thanks a lot for the input.
I am going to design some new ones and print in tpu.
I will post them if I end up finishing it.
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Old Jan 12, 2023 | 01:03 PM
  #35  
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'08 GL 320 CDI
Originally Posted by Waspjr
Checked this morning and it’s still dripping from roof rack so I will remove that tonight and tape holes and see if I still get water coming in.
also got the drivers seat off and it has water underneath doesn’t look like any damage there but I will still take apart acf50 and treat it anyways.
I work in the marine business. I have never removed a roof rack foot but it seems to me that it's going to be similar to a boat's deck cleat (for tying up a rope). If that's the case, just about the best thing that can be used is butyl rubber tape. It never hardens, will last longer than anything in a tube and is perfect for a mechanical joint. You'd put some between the two mating surfaces and then wrap a little around the underside of the bolt head - smoosh some around the shaft of the bolt about 1/2" wide (starting at the head to about 1/2" down the shaft). You should then be good for about 30 or 40 years.

Just another idea to ponder!
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Old Jan 13, 2023 | 10:45 AM
  #36  
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Gl350 x164 Silverado HD f350 wakesetter
Thanks for the tips and help everyone!!
I have found the leak and found the reason.
it appears someone removed the nut in the past or it rattled out.
mat first I didn’t know how the roof rails connected.
i popped a cover off thinking bolts went from top down. Then I looked at the other side and then it was obvious.
I tightened it up and leak checked it and it’s not weeping or wet anymore.
the bolt was there from factory there is marks from it being installed. And I fished the nut out of the rear pillar with a magnet.
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Old Jan 13, 2023 | 11:56 AM
  #37  
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2007 GL450
Originally Posted by Waspjr
Thanks for the tips and help everyone!!
I have found the leak and found the reason.
it appears someone removed the nut in the past or it rattled out.
mat first I didn’t know how the roof rails connected.
i popped a cover off thinking bolts went from top down. Then I looked at the other side and then it was obvious.
I tightened it up and leak checked it and it’s not weeping or wet anymore.
the bolt was there from factory there is marks from it being installed. And I fished the nut out of the rear pillar with a magnet.
The roof rails have studs that penetrate down through the roof, and there is a nut on each stud, right?

Since there is a rubber gasket, if the nut is not on gutentite, wiggling the roof rack will walk the nut right off the bolt-stud.

I am tempted to open access holes in the headliner, much like popping off the armrests to allow rear shock replacement.
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Old Jan 13, 2023 | 01:35 PM
  #38  
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Gl350 x164 Silverado HD f350 wakesetter
Originally Posted by eric_in_sd
The roof rails have studs that penetrate down through the roof, and there is a nut on each stud, right?

Since there is a rubber gasket, if the nut is not on gutentite, wiggling the roof rack will walk the nut right off the bolt-stud.

I am tempted to open access holes in the headliner, much like popping off the armrests to allow rear shock replacement.
yes It would be easy to sneak a boroscope in there and have a peek. I will anti sabotage seal it and will be leaving panels off for a while until I know for sure my water issues are solved.
I will be weeping in acf50 into all the harnesses as well. Ohhh the fun
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Old Jan 13, 2023 | 04:59 PM
  #39  
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Originally Posted by Waspjr
acf50 into all the harnesses
Curious, why ACF50 and not just silicone spray. I'd be worried the petroleum in ACF50 might compromise wire insulation. I am no expert, though.
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Old Jan 13, 2023 | 05:49 PM
  #40  
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Gl350 x164 Silverado HD f350 wakesetter
Originally Posted by eric_in_sd
Curious, why ACF50 and not just silicone spray. I'd be worried the petroleum in ACF50 might compromise wire insulation. I am no expert, though.
I have been using it for many many years.
it has many uses and is a amazing product.
only recently can general public get it.
Specifically light sockets and electrical connections.
get some try it don’t be scared lol
it has amazing capillary action. If they where at all worried at wire sheath there would be warnings everywhere.
literally ppl spray whole vehicles with it.
have a little boo at it online
it does not contain silicone either.


Last edited by Waspjr; Jan 13, 2023 at 05:51 PM.
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Old Jan 18, 2023 | 10:20 AM
  #41  
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Gl350 x164 Silverado HD f350 wakesetter
Drove it to work today without interior I still have some water sloshing around so I won’t have the interior in for a while.
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Old Feb 17, 2026 | 08:34 PM
  #42  
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Help lol

Originally Posted by Waspjr
Hello everyone I am sure this is probably common knowledge now at this point but is anyone else putting a bilge pump in the battery box JJ.

seems I have water coming in from driving when road is wet.
sun roof closed and no rain was a great thing to find after a terrible holiday travel experience.

anyways I sucked a gallon of water out of battery comp.
car would not crank and not recognize a gear or change gears.

pulled the floor up and took the control box out to try and ultrasonic it back to life.
mans acf50 the crap out of it. I still can’t see where water is coming from. I will need to have a friend pressure wash the underside while I do a headstand in the battery comp I assume.

going to get a new aux batter and plug it in and try when I get home today.
just wanted to share my findings with you all.

I am driving in this pic








did you even find the problem lol I’m having that same issue now with mine…
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Old Feb 18, 2026 | 03:07 PM
  #43  
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Originally Posted by Allyanne
did you even find the problem lol I’m having that same issue now with mine…
OP has not been active on this board since this thread, so I am hoping he took our advice and got rid of the vehicle or turned it into something fun that does not need to be reliable.

@Allyanne , please start a new thread on this subject with any pictures of your particular car and description of symptoms and we can help you from there.
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