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

2008 Mercedes GL450

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Old Dec 22, 2023 | 10:48 AM
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2008 Mercedes GL450

Hello,

so I am hearing a swishing noise which sounds like water in the cabin. I have already checked under the driver’s seat which is completely drive as well as the trunk where the spare tire which is also dry. Can anyone post all the drains in the car so I can try to clean them out properly?
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Old Dec 22, 2023 | 10:56 AM
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Originally Posted by clb0099
Hello,

so I am hearing a swishing noise which sounds like water in the cabin. I have already checked under the driver’s seat which is completely drive as well as the trunk where the spare tire which is also dry. Can anyone post all the drains in the car so I can try to clean them out properly?
Check on the side pods in the trunk. The washer fluid hose passes thru the driver's side pod. If broken, or disconnected it will poor fluid to the pod. Similarly, check there is no leak from the outside on those two section.

The important bit is that there are electronics on both pods, and if they get wet you know the rest.
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Old Dec 22, 2023 | 01:10 PM
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You should check under the passenger's seat as well - if you checked under the driver's seat, the passenger's side is a piece of cake.

Where is the sound coming from? Behind the dash? That could be from a leaking sunroof... which will often show up under a seat, as well. I'm not sure about the 2 rear sunroof drains where they show up if they leak... but check all 4 drains.

Check the windshield cowl vent area, too.
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Old Dec 22, 2023 | 02:58 PM
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Your cabin air filter drain or the ac evaporator box drain is clogged. If you're hearing swishing in the dash its one of these two.
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Old Dec 22, 2023 | 03:43 PM
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Check the doors, if the drain holes are blocked then they can hold water, open a door and swing it , my Jaguar had this a few weeks ago.
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Old Dec 22, 2023 | 05:36 PM
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Can any post a diagram of where all these drains are located? I just removed the driver’s seat and it’s completely dr underneath. The amp is perfectly fine. No signs of water ever getting into there. What’s odd is now I no sound coming from the radio… I am going to check the rear trunk side compartments next but it’s 34 degrees here in nj right now.
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Old Dec 22, 2023 | 06:03 PM
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Originally Posted by clb0099
Can any post a diagram of where all these drains are located? I just removed the driver’s seat and it’s completely dr underneath. The amp is perfectly fine. No signs of water ever getting into there. What’s odd is now I no sound coming from the radio… I am going to check the rear trunk side compartments next but it’s 34 degrees here in nj right now.
Not sure about any other drain locations but on my early Jaguar they are partially hidden under the lower rubber seal that runs along the bottom edge of the doors, I parked the car on a slope after I realised the noise was from the passenger door and eased the rubber to one side and prodded the drain holes and watched the water run out !. We had had a very heavy night of rain and the rain finds its way down past the rubber seal of the side door window glass, as cars get older I guess they let more water through than normal due to less flexibility in them.
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Old Dec 22, 2023 | 06:18 PM
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Originally Posted by clb0099
Can any post a diagram of where all these drains are located? I just removed the driver’s seat and it’s completely dr underneath. The amp is perfectly fine. No signs of water ever getting into there. What’s odd is now I no sound coming from the radio… I am going to check the rear trunk side compartments next but it’s 34 degrees here in nj right now.
Are you NOT going to check under the passenger's seat? That one is easy and you can do it now with a flashlight (if you felt so compelled!)

Don't have pics - but most are pretty easy to locate just by using the descriptions we've described.
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Old Dec 22, 2023 | 06:39 PM
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So I was already under the passenger seat as I just replaced the aux and main batteries a week ago.. there no water..
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Old Dec 23, 2023 | 09:41 AM
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Originally Posted by clb0099
So I was already under the passenger seat as I just replaced the aux and main batteries a week ago.. there no water..
OK, thanks for that. Probably could've mentioned that in that first place

In case you missed the question above, can you be more specific as to where the sound is coming from? "In the cabin" could be just about anywhere... and it's hard for us to hear it from where we are!
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