Check Coolant level light when its full
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Joined: Mar 2019
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2012 ML350 Bluetech
Check Coolant level light when its full
Good Evening guys I have a 2012 ML 350 Bluetec. A couple of days ago I got a check coolant level light come on my car. I went out and looked and it was fine, more than enough coolant. It went away and then it has periodically come on and off since then I was wondering if anyone had any insight into this. Thanks.
Senior Member
Joined: Jul 2017
Posts: 487
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From: DFW, TX
Ml350 bluetec
How are you "checking" the coolant level? On page 367 or there about in the owners manual. There are instructions on how to do this properly:
- Let engine cool down.
- Open Coolant cap slowly on the reservoir.
- Look at the level of the coolant in relation to the Marker Bar.
- If coolant warm it should be about 1.5cm/0.6 in above the marker bar.
- If coolant cold it should be at the height of the marker bar.
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Joined: Sep 2018
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From: unbegrenzt
2017 GLE350 4MATIC
If the vehicle is indeed full with coolant, following the procedure above, I would suspect a failed or dirty level sensor. The sensor should be found attached to the reservoir tank, as in my other M-B vehicles. It may take disassembly of other parts, before reaching the coolant level sensor.
There are many threads on this. The coolant sensor appears to be inexpensive, and the replacement seems not too difficult. Need to do some digging to find the right sensor part number for your vehicle.
There are many threads on this. The coolant sensor appears to be inexpensive, and the replacement seems not too difficult. Need to do some digging to find the right sensor part number for your vehicle.
Junior Member
Joined: Mar 2017
Posts: 35
Likes: 1
From: Boston, MA
2012 ML350
This happens to my 14 as well. Its been talked about on this site. Check your windshield wiper fluid level. Mine ran low and the low coolant indicator came on. My coolant level was fine so I just filled my wiper fluid up and the alert disappeared. Its weird I know but it happened twice over this last winter and the same solution worked each time. They must share a circuit / system or something.
Good Evening guys I have a 2012 ML 350 Bluetec. A couple of days ago I got a check coolant level light come on my car. I went out and looked and it was fine, more than enough coolant. It went away and then it has periodically come on and off since then I was wondering if anyone had any insight into this. Thanks.
Senior Member
Joined: Jul 2017
Posts: 487
Likes: 114
From: DFW, TX
Ml350 bluetec
This happens to my 14 as well. Its been talked about on this site. Check your windshield wiper fluid level. Mine ran low and the low coolant indicator came on. My coolant level was fine so I just filled my wiper fluid up and the alert disappeared. Its weird I know but it happened twice over this last winter and the same solution worked each time. They must share a circuit / system or something.
Senior Member
Joined: Sep 2012
Posts: 323
Likes: 31
From: Ottawa ON Canada
2015 ML350 Bluetec
I had the same message on my 2015.... The coolant level sensor is finicky. The problem usually arises as the outside temperature cools down overnight, as in the Fall going onto Winter. Best way to get rid of the headache is to add 1/4 cup of Distilled water to the system. It really doesn't take much to make the irritant go away.... that is if your coolant system is definitively full.
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Senior Member
Joined: Jul 2017
Posts: 487
Likes: 114
From: DFW, TX
Ml350 bluetec
Something strange there. I got separate indicator for both coolant level and windshield washer level. And the bottles are in separate areas on the vehicle. I know during the winter, the coolant light would come on while cold and go away once the coolant warmed up and the level came back up. So am I scratching my head understanding how you got ONE indicator for coolant and Washer, and fixed it by filling the windshield wash bottle.........since there are 2 separate circuits and 2 separate dash indicators.
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Senior Member
Joined: Jul 2017
Posts: 487
Likes: 114
From: DFW, TX
Ml350 bluetec
This happens to my 14 as well. Its been talked about on this site. Check your windshield wiper fluid level. Mine ran low and the low coolant indicator came on. My coolant level was fine so I just filled my wiper fluid up and the alert disappeared. Its weird I know but it happened twice over this last winter and the same solution worked each time. They must share a circuit / system or something.
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Joined: Mar 2004
Posts: 5,017
Likes: 16
From: Ft. Lauderdale Area, USA
2015 ML 350
Good Evening guys I have a 2012 ML 350 Bluetec. A couple of days ago I got a check coolant level light come on my car. I went out and looked and it was fine, more than enough coolant. It went away and then it has periodically come on and off since then I was wondering if anyone had any insight into this. Thanks.
