Check coolant level light on cold starts.
12-03-2012, 07:17 PM
#26
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2012 ML 350 BlueTec
My car is also at 7500 km, 4 months old. I got a warning saying "Top up the coolant, see owners manual". I did so and filled it completely up to the lid. The warning is gone now. The dealer told me that the reason may be they forgot to top up the fluid when the car arrived from the factory before they delivered to me. Otherwise, if this happens again, there is a leak.
12-05-2012, 03:12 PM
#27
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SL65 - ML63
The only way I could correct mine was to add more anti-freeze. Anxious to see if this is a one time problem or if it persists in the future. Interesting that I never had any signs of leakage though.
12-05-2012, 08:46 PM
#28
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2012 ML 350 BlueTec
If its a head gasket or block problem you will not see the leak. But I doubt its an engine issue their early on.
01-12-2013, 03:58 PM
#29
Junior Member
Hi,
I need to purchase coolant for my 2012 ML350 Bluetec. Is there a generic brand that I should purchase or do I have to go to the dealer? Any brand recommendations? Thx!
I need to purchase coolant for my 2012 ML350 Bluetec. Is there a generic brand that I should purchase or do I have to go to the dealer? Any brand recommendations? Thx!
01-12-2013, 09:49 PM
#30
Senior Member
Service Liason told me that the washer fluid was low and that triggered the check coolant level warning. 
So I called "B-S"
Service manager came over pacified the situation said he would do "research" called me back an hour later and told me that COOLANT and WASHERFLUID both run on the same "circuit board."
"The vehicle noticed that SOME fluid level is at a critical low and therefore triggered the most critical warning so that you would come into the stealership and get it checked out."
(if this is true I just lost all respect for German engineering)
I am not embellishing but this what he attributed it to.
So I called "B-S"
Service manager came over pacified the situation said he would do "research" called me back an hour later and told me that COOLANT and WASHERFLUID both run on the same "circuit board."
"The vehicle noticed that SOME fluid level is at a critical low and therefore triggered the most critical warning so that you would come into the stealership and get it checked out."
(if this is true I just lost all respect for German engineering)I am not embellishing but this what he attributed it to.
01-18-2020, 08:33 AM
#31
Level check
Queue sad trombone sound... happened to me too when I started mine up at Denver airport after standing in the parking garage for 24 hours. Am hoping it's just "gas" in the system as a previous poster suggested.
The "hot" level seems to be totally full, while the "cold" level seems to be about an inch from the top of the black plastic. I don't see any "fill to here" marks on the side of the reservoir, but I wouldn't imagine that the level warrants a warning light?
Oh well, warning hasn't come on since - I'm planning to drive for a another week or so to check warning light behaviour before topping her up with additional coolant.
The "hot" level seems to be totally full, while the "cold" level seems to be about an inch from the top of the black plastic. I don't see any "fill to here" marks on the side of the reservoir, but I wouldn't imagine that the level warrants a warning light?
Oh well, warning hasn't come on since - I'm planning to drive for a another week or so to check warning light behaviour before topping her up with additional coolant.
01-20-2020, 09:40 PM
#33
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Had this happen to me on my ML350. Happened once then never again. Sometimes the sensor maybe just acts funky due to extreme cold. It was like -10 when it happened lol.
01-20-2020, 09:41 PM
#34
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Back when I owned a W203 C Class the coolant light would come on every time my windshield washer fluid was low. (I would actually get both a low windshield washer fluid warning and low coolant warning) The explanation you received is them same they gave me back in 2007. I highly doubt that is the case this time with the W166
01-21-2020, 05:45 AM
#35
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2012 X6 35i Sport, 2013 ML 350 BT, 2019 4Runner TRD Pro, 2020 CRV-AWD
I get the low coolant level message as well, started about a month ago. After reading this thread, I added a bit of coolant to the tank on Sunday, which had a perfectly fine level to begin with. I have to remember to ask the wife it the message went away....
