I keep getting a dashboard warning to check coolant level. However, my coolant reservoir is full! It does go away after awhile but it just keeps coming back. What could be happening?
My car is a 2014 Mercedes ML350 Bluets with 152,000 miles. Any ideas? -- Jim

 

moved to W166 forum...

 

How long ago was the fluid changed? I'd also test the sensor or at least make sure it's not gooped up.