07-25-2021, 10:50 AM | #1 |
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Low coolant warning at startup
I get a low coolant level warning at startup but I'll shut the car off and the message never comes back...I checked the front Reservoir and it's at the full mark any suggestions? Thank you in advance
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07-25-2021, 11:22 AM | #2 |
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Read thread: https://www.6post.com/forums/showthread.php?t=1711023
Look at post #6 and check the drivers side filler tube. |
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07-25-2021, 11:31 AM | #3 | |
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07-26-2021, 10:03 AM | #4 | |
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Depending on your model year/build date...the filler cap for the engine coolant circuit can be a plain black cap (like in pic below)...or it could have some writing on it like the cap for the charge air circuit.
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07-28-2021, 08:46 AM | #5 | ||
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07-28-2021, 12:18 PM | #7 |
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So I opened the fill tube on the driver's side before starting the car up and it made a vacuum sound when loosening up the cap. I saw coolant visible from the top so I closed it and fired the car up and now no more low coolant message. Could've it been air bubble/pocket? Had a coolant flush done at the dealer a year ago...
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07-28-2021, 02:01 PM | #8 | |
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07-28-2021, 03:01 PM | #9 | ||
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07-28-2021, 03:14 PM | #10 |
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Try to fashion some type of tool that measures the proper distance down from the top. I use a small pipe cleaner and I bent the tip to make a hook so that if it "accidentally" slipped out of my hand etc...that it wouldn't find itself at the bottom of the fill tube! Then measured down 160mm (and made a mark)...then measured down 110mm (and made a mark).
When I stick this tool down into the filler tube and pull it back out...if it is wet between those two marks...then I know that I'm at the proper fill. If is below the 160mm mark...then I would need to top up the coolant. Its simple to make a tool...you just need something long enough and you don't have to replace in your kitchen drawer (so that your wife or significant other won't beat you down).
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07-28-2021, 03:16 PM | #11 | |
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07-28-2021, 04:01 PM | #12 |
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07-28-2021, 04:04 PM | #13 | |
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06-07-2023, 11:21 AM | #14 |
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I apologize for bringing up this old thread. I had a similar issue with my vehicle recently; the radiator coolant was mysteriously getting low. As I further checked the hoses, cracks in the radiator, or head gasket, there was no sign of leakage. It turned out that my radiator cap was damaged and it’s not holding the standard operating pressure anymore, so I immediately replaced it. I came across an in-depth article that may be worth reading. Search for "Mercedes-Benz Check Coolant Level Warning Light on YOUCANIC" and you will see an article that goes over common causes and possible fixes. You can read about it yourself. I hope this information can assist someone else with a similar issue.
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