M-Class (W166) Produced 2012-2015

Coolant Light

Old Dec 15, 2023 | 09:46 AM
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regclown124's Avatar
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2015 ML350
Coolant Light

Hi guys, happy holidays! I noticed recently that "Check coolant level, see operators manual" comes up on my dash. Funny part is that the message goes away about 30 seconds after I start the car and never comes back on until it sits overnight. Car runs fine and the temperature stays consistent, I do not see any leaks either. The car was recently serviced 6 months back and all checked out well. It went to the dealer in August for a recall and the tech didn't mention anything (other then a leaky tire valve) which I knew about before.

Checked the coolant level and it was a just below full. Looking through the reservoir, the color is a pinkish/orangeso it doesn't seem bad. Any suggestions? Should I just top it off to see the light goes away?

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Old Dec 23, 2025 | 07:21 AM
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eddieo45's Avatar
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From: Milton/Westport, MA USA
me: 2015 SL400 & 2015 ML400; wife: 2022 GLC Coupe; daughter: 2017 GLC SUV
I added distilled water to mine; problem solved.
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