GL Class (X166) 2013-2015 after facelift became GLS (X166)

Typical M-B Service Experience

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Old Aug 5, 2019 | 05:24 PM
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2015 GL 550
Typical M-B Service Experience



After lunch when I started our GL550 we got this message. No problem ... we drove directly to our M-B dealership, presented our vehicle and showed them this photograph. By the time the paperwork was done our vehicle was "topped up" with coolant and we were on our way!
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Old Aug 5, 2019 | 07:47 PM
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Did they check to see why/where your coolant was leaking? It's common for the plastic tube supplying coolant to the turbos to leak.
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Old Aug 6, 2019 | 08:35 AM
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No, they did not, but we had and hopefully solved that problem earlier this year. Our GL550 was in for two weeks while parts were shipped from Germany. A coolant leak in the engine was detected and corrected ... obviously under warranty.

I'm willing to blame the extreme hot weather lately for excess evaporation from the overflow tank, which is an easy problem to solve ... add more coolant!
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Old Aug 6, 2019 | 10:35 AM
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Obviously worse than we thought! We pulled into this parking space dripping coolant ... see the track on the left. 15 minutes later we backed out and left this huge puddle under the driver side front of the vehicle.
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Old Aug 6, 2019 | 01:57 PM
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Yep my 2014 GL450 w/ just over 60k miles did that also this morning. Huge puddle in garage under it. Towing to dealer in a couple hours. Curious if it will turn out to be that turbo-related part.
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Old Aug 6, 2019 | 04:38 PM
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Just retrieved our 2015 GL550. By pressure testing the coolant system they found the coolant fitting on the corner of the left cylinder head to the turbocharger was cracked and leaking. They removed and replaced the coolant pipe to the left turbocharger, which presumably was the source of the leak, refilled the system with fresh coolant, checked again for leaks and topped off with coolant after repairs ... plus a car wash. All done under an extended warranty that took effect on our vehicles "4th birthday" last Spring.
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Old Aug 6, 2019 | 06:28 PM
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It was interesting that you thought it was good service but when, in fact, it was horrible service to just add coolant. Good thing you were not on a long road trip since you would have been stranded with an overheated/damaged engine. I'm happy for you that it was finally fixed the right way but I would be highly upset.
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Old Aug 6, 2019 | 09:44 PM
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You’re right, but we’ve been adding coolant infrequently for some time. Further, we presumed that the two weeks our vehicle spent for cooling system repairs earlier this year was the end of the problem. When we got the low coolant warning we assumed it was due to recent hot weather. Obviously not as the above parking lot photograph shows!

So ... any “routine warning” ... there’s an oxymoron ... should be escalated until the root cause is determined.
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Old Aug 8, 2019 | 05:56 PM
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Originally Posted by Elric99
Yep my 2014 GL450 w/ just over 60k miles did that also this morning. Huge puddle in garage under it. Towing to dealer in a couple hours. Curious if it will turn out to be that turbo-related part.
Got mine back yesterday, yes it was the left side turbo coolant hose that failed.
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