GLK-Class (X204) Produced 2008-2014

Wet floor drivers side with pics

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Old Oct 20, 2020 | 12:19 PM
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2010 Glk350
Wet floor drivers side with pics

Hello all,

I need some help. I woke up the other day and noticed my driver side carpet was wet...we had some heavy rain. I pulled off the panel under the driver side and pulled back the carpet to find where the water was coming from. I found water underneath this (see picture). The foam insulation underneath was soaked...the foam above is bone dry. Any idea where water could be coming from?

The bottom of the gasket that meets the firewall seems to be where water is coming in.

Any help is appreciated.
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Old Oct 20, 2020 | 02:24 PM
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Just an update. Pulled carpet out and the floor is dry...just the foam and carpet wet. The fluid is clear but seems to be slightly oily? You can see where the fluid is running down by gas pedal.

Any clues?



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Old Oct 20, 2020 | 05:23 PM
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know on some other cars (like Cayenne) you need to make sure outside drain vents (by the windshield) are not clogged otherwise water finds way over time.
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Old Oct 20, 2020 | 05:33 PM
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Oily ? Maybe antifreeze, check coolant level.
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Old Oct 20, 2020 | 06:28 PM
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The drain for rain is on either side of the wipers in the corner, slowly run a hose and see if it drains out below , then leave the hose to see if it leaks inside.
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Old Oct 20, 2020 | 06:53 PM
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Originally Posted by NYCGLK
know on some other cars (like Cayenne) you need to make sure outside drain vents (by the windshield) are not clogged otherwise water finds way over time.
Ya I ran water through the drain vents and they are clear. Immediately water was running under the car behind the driver wheel...and just behind passenger wheel when I checked that one as well.

Very frustrating. Also checked sunroof drains and they are also clear.
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Old Oct 20, 2020 | 06:58 PM
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Originally Posted by Mmr1
Oily ? Maybe antifreeze, check coolant level.
Coolant level is fine. The fluid is clear and not green. Might have to put on hoist and see if maybe the drain for the AC is blocked underneath? Anyone know if the end of the AC drain tube has that problematic “reed valve”?

Its supposed to rain tomorrow...with carpet out and a nice big towel where the leak seems to be...maybe I can pinpoint where it’s coming from.

Thanks for reply!
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Old Oct 21, 2020 | 08:46 AM
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Update again!

Well now I’m completely confused. We had a torrential downpour last night and I was fully expecting the towel I put down by the gas pedal to be soaked. Dry as a bone...and so was the gasket area that was wet previously.

So I am stumped.
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Old Oct 21, 2020 | 08:51 AM
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You can see the ac condensate draining out if the hose is clear , but is it warm and humid where you are?
Maybe windshield washer fluid?
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Old Oct 21, 2020 | 09:00 AM
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Originally Posted by Mmr1
You can see the ac condensate draining out if the hose is clear , but is it warm and humid where you are?
Maybe windshield washer fluid?
No it’s cold where I live in Canada now...haven’t used the AC in months. I guess I’ll have to put in hoist and check drain hose?

I never thought to check washer fluid. You think a washer hose might be leaking? The strange part is the fluid seemed to be oily.

The hunt continues.
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Old Oct 21, 2020 | 10:57 AM
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You will only get condensate out the drain hose is if the ac is running , I don’t think it will drip unless it’s warm out and humid like 70f at least.
The only thing that’s oily is usually antifreeze, did anyone fill the tank recently.
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Old Oct 21, 2020 | 11:14 AM
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Originally Posted by Mmr1
You will only get condensate out the drain hose is if the ac is running , I don’t think it will drip unless it’s warm out and humid like 70f at least.
The only thing that’s oily is usually antifreeze, did anyone fill the tank recently.
Nobody has topped up the antifreeze tank and it doesn’t seem to be overfilled. I looked at it the other day.

I’ll keep looking and see if a hose from something is dripping onto that area and causing the leak into the cabin.

Very frustrating.
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Old Oct 21, 2020 | 12:45 PM
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I don’t think a small amount of antifreeze will look green, put your finger in the tank and see if it feels the same as the floor liquid , check if fluid is clear or milky, but if it’s not low by now it’s probably something else
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Old Oct 21, 2020 | 01:09 PM
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Get a good inspection of the fluid. You should be able to affirmatively identify what it is.

Smell
Consistency (oily, sticky)
Color

If it’s water, the sources are external leak from rain, or HVAC condensate.

Of it’s not water, the sampling procedure points you to the next step.
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Old Oct 21, 2020 | 04:06 PM
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Originally Posted by Mmr1
I don’t think a small amount of antifreeze will look green, put your finger in the tank and see if it feels the same as the floor liquid , check if fluid is clear or milky, but if it’s not low by now it’s probably something else
If it is antifreeze...are we talking heater core problem?
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Old Oct 21, 2020 | 06:00 PM
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Your coolant level would drop if it’s antifreeze, if it’s the heater core you should smell it and windows could fog up, check coolant when cold tomorrow and keep an eye on it. Maybe scoop up some liquid on white paper and examine it.
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Old Oct 21, 2020 | 06:27 PM
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Originally Posted by Mmr1
Your coolant level would drop if it’s antifreeze, if it’s the heater core you should smell it and windows could fog up, check coolant when cold tomorrow and keep an eye on it. Maybe scoop up some liquid on white paper and examine it.
Will do. Seems to have stopped...for now. Everything was dry this morning.
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Old Oct 21, 2020 | 07:34 PM
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Have you been running the ac?
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Old Oct 21, 2020 | 10:04 PM
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Try running the car in the driveway, warmed up with the heat on the highest temperature setting, A/C button turned off (not lit). Raise the rpms over 2,000rpm and hold for 20-30 seconds and see if you can cause a leak.
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Old Oct 22, 2020 | 08:14 AM
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Originally Posted by Mmr1
Have you been running the ac?
No I haven’t. It’s been months since I ran it.
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Old Oct 22, 2020 | 08:16 AM
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Originally Posted by chassis
Try running the car in the driveway, warmed up with the heat on the highest temperature setting, A/C button turned off (not lit). Raise the rpms over 2,000rpm and hold for 20-30 seconds and see if you can cause a leak.
I will try that.
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Old Oct 23, 2020 | 09:21 AM
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Originally Posted by chassis
Try running the car in the driveway, warmed up with the heat on the highest temperature setting, A/C button turned off (not lit). Raise the rpms over 2,000rpm and hold for 20-30 seconds and see if you can cause a leak.
I tried this yesterday and nothing is leaking. Now I am stumped. If it happens again I will try and collect some of the liquid and analyze it more thoroughly.
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Old Oct 23, 2020 | 03:32 PM
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Originally Posted by Blade Runner
I tried this yesterday and nothing is leaking. Now I am stumped. If it happens again I will try and collect some of the liquid and analyze it more thoroughly.
If the test was conclusive, which it isn't necessarily, it would mean the HVAC unit isn't leaking coolant. Another test is to run the vehicle in the driveway, with the A/C "on" and the temp turned to the coldest setting. Let the car run this way for quite some time, maybe 15 minutes at least.

The two tests are intended to look for either coolant leak or condensate leak from the HVAC unit. If no leaking after these two tests, the water is (presumably) not coming from the HVAC system, but rather somewhere else. For example cowl drain, sunroof drain, door seals, windshield seals, etc.

Have you had any glass replaced on the vehicle?
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Old Oct 27, 2020 | 09:05 PM
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taste it. just a dab. if its antifreeze, which I doubt because u would smell a sweet smell. you will know right away by taste lol. like half a drop. then rinse. lol. no worse than fast food.
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Old Apr 19, 2021 | 07:08 PM
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My 11 GLK does this, too. I have found that if I go through the auto wash with the vent fan on, it leaks on the right side floor. If I do it with the fan off, no water drips from the blower box area.. I've not narrowed the location yet, but that's my current analysis.
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