GLK-Class (X204) Produced 2008-2014

Antifreeze smell.. 2015 GLK350

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Old Feb 3, 2019 | 04:20 PM
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GLK 350
Antifreeze smell.. 2015 GLK350

My wifes 2015 GLK350 has a smell of antifreeze at front of car, drivers side at grill. When I open the hood it is by the radiator. There is no fluid , steam or signs of fluid anywhere. And it only smells when hot, after driving it.
I have no smell of it in car, with heater on.
Thoughts?
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Old Feb 3, 2019 | 04:58 PM
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Originally Posted by Plutoe
Yep a Big thought----have the cooling system pressure tested!
I will get ahold of dealership this week and schedule a check of the system.
We just had the 58000 mile oil chanhe and had transmission serviced.
With all the checks they do. You would think a antifreeze and system check would be on their list.
I did squeeze hoses and held them with leather gloves. No water came out. Nothing on garage floor.

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Old Feb 3, 2019 | 08:04 PM
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If your not loosing fluid it may be nothing to worry about. Check the resivour and keep an eye on it.
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Old Feb 4, 2019 | 10:56 AM
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I checked this morning, its full and an Orange color. Oil is clean, no signs of milky oil/water mix...
Just a concern, as I am a little OCD on maintenance. And I really dont want to track a water leak within this car.. Its still under warranty...
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Old Feb 4, 2019 | 11:49 AM
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The tank should not be full more like half full , your manual will show what is full, since you said you recently had it serviced , if they overfilled it, when it’s fully hot excess fluid will come out by itself and smell. The tank is an expansion tank and needs room for the expansion of the fluid.
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Old Feb 4, 2019 | 11:57 AM
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Originally Posted by Mmr1
The tank should not be full more like half full , your manual will show what is full, since you said you recently had it serviced , if they overfilled it, when it’s fully hot excess fluid will come out by itself and smell. The tank is an expansion tank and needs room for the expansion of the fluid.
Thnx. I will recheck it when she gets home. It should have a hot/max and cool/low level correct?
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Old Feb 4, 2019 | 12:00 PM
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No it’s different , you have to see it in the manual, I think low is when a ring is exposed, but total fill level is like 1/2 full without a marking.
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Old Feb 4, 2019 | 12:20 PM
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Thanks again, I will use the manual when she gets home to check..
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Old Feb 4, 2019 | 04:36 PM
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Originally Posted by Steves40th
Thnx. I will recheck it when she gets home. It should have a hot/max and cool/low level correct?
They don't have a conventional expansion tank with MIN or MAX levels on GLK. Have to check by looking into the tank. Here is from User Manual:


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Old Feb 4, 2019 | 05:14 PM
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GLK 350

You can see its good. Been sitting for 3 hrs. The little blue tinted line is where the water is.

Last edited by Steves40th; Feb 4, 2019 at 06:22 PM.
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Old Feb 4, 2019 | 06:30 PM
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Well if that’s your actual level it’s WAY , Way , to high . As I said it should be at near 1/2 full , so blowing off excess is normal , and it’s Not normal to overfill and stress your career cooling system. , which you are actually doing !
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Old Feb 4, 2019 | 06:31 PM
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The proper level is like 2” Lower
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Old Feb 4, 2019 | 06:33 PM
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2013 glk 350

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Old Feb 4, 2019 | 06:33 PM
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Originally Posted by Mmr1
Well if that’s your actual level it’s WAY , Way , to high . As I said it should be at near 1/2 full , so blowing off excess is normal , and it’s Not normal to overfill and stress your career cooling system. , which you are actually doing !
I haven't added a damn thing. This must be the dealership.
I will check it in the morning. And take some out if need be.

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Old Feb 4, 2019 | 06:38 PM
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I’m not sure on height of fill , but if it’s not near half , your just over filling it yourself, and blowing out excess from the Pressure release . And stinking it up like antifreeze.
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Old Feb 4, 2019 | 06:41 PM
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Don’t take out anything , the Pressure Relief does that automatically. You have nothing to worry about, unless the level goes below the Indicator, (the blade) or a light comes on .
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Old Feb 4, 2019 | 06:45 PM
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Okay, I just went out, opened it up as we ust got home a few minutes ago. I used a turkey baster and removed fluid, kind of a pinkish color, to the level recommended for warm/hot. More to follow.
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Old Feb 4, 2019 | 07:18 PM
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Here is where I smell it. The overflow is on the other side, no smell there.
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Old Feb 5, 2019 | 03:50 AM
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That looks like where the Top hose connects, maybe a mechanic loosened it and left it loose.
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Old Feb 5, 2019 | 03:51 AM
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See if you can tighten it or take it in
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Old Feb 5, 2019 | 05:31 AM
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MB uses a quick release clamp on the hoses. No tightening.
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Old Feb 5, 2019 | 03:25 PM
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2015 GLK350
I have been noticing antifreeze smell around the front of my 2015 350 as well. The level is in the reservoir is normal to slightly low. I poked around with a flash light and I can't find any residue indicating leakage, but I only looked in the easily accessible areas. I plan to give it a more thorough inspection next time I change the oil.
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Old Feb 6, 2019 | 12:01 AM
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Hard to find leaks need UV dye and and a UV light ,
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