Coolant warning still comes on
#1
Coolant warning still comes on
I have a 2018 GLS 450 with 44K miles. I recently got 'Check Coolant Level' warning message. I went ahead and did a coolant flush (flush & replace) at a local Indy shop. However, the coolant warning still flashes up in my car. It has been 3-4 days since I changed the coolant and have also turned on heat / defogger to maximum and drove for around 50 miles since the coolant work was done.
Any ideas on what may be going on?
Thanks!
Any ideas on what may be going on?
Thanks!
#2
I have a 2018 GLS 450 with 44K miles. I recently got 'Check Coolant Level' warning message. I went ahead and did a coolant flush (flush & replace) at a local Indy shop. However, the coolant warning still flashes up in my car. It has been 3-4 days since I changed the coolant and have also turned on heat / defogger to maximum and drove for around 50 miles since the coolant work was done.
Any ideas on what may be going on?
Thanks!
Any ideas on what may be going on?
Thanks!
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cahaba (02-09-2023)
The following users liked this post:
cahaba (02-09-2023)
#7
The coolant warning / message is still present even after I topped off both coolant tanks. Both of these tanks were pretty full, brimming almost to the top -- even before I topped them.
Any ideas on what may be going on here? Is there a sensor that needs to be looked into?
Thanks.
Any ideas on what may be going on here? Is there a sensor that needs to be looked into?
Thanks.
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#8
I have a 2018 also. I get the coolant warning only at start up if the car sits outside in cold weather. Quite a few people report this, I am not concerned but I wanted to throw it out there if it only pops up in the morning or sitting in the cold.
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clarkpittman (02-18-2023)
#9
MBWorld Fanatic!
As to OP's problem, these systems used to be stone simple: a float closes a switch when the level drops and the light comes on. Whether they're that simple these days, who knows, probably not, but you could always try unplugging the sensor, if you can find it, and see what happens.
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masscomguru (02-18-2023)
#10
Junior Member
2018 here as well, same story with the cold weather. I only have the warning when I'm parked in my steep driveway and the overnight temp is below 30 degrees F
Last edited by Eonetiller; 03-20-2023 at 09:16 PM.
#11
My coolant warning problem has been resolved. As far as I can tell -- it was due to unusual reason: driveway where my car is parked overnight has a upward gradient slope of about 5%. And in the winter I think the coolant condensed so that the coolant level dipped below the sensor, and gave low coolant warning. Once I filled the coolant to the top of the cap (more than the max allowed level) -- the issue got resolved. Not sure if filling more than recommended level is a good practice in the long run though.
#12
MBWorld Fanatic!