So recently I noticed that my coolant level light came on. (Especially right after I floor it) I checked but coolant is just right where it needs to be. Car doesn’t over heat or anything. Anyone know what I need to check or replace?

 

Coolant Llevel sensor in the overflow tank. See attached - two pages.

 

Talking about “170” on the chart right?

 

Correct - the item number 170 and part number are listed on the second page.

 

Just replaced. For some reason It's still there. Might just be low coolant I guess. I don't even see the fill line. Any idea where it should be to? I have blue coolant I assume that's just normal coolant from Mercedes Dealer

 

Blue is the OEM coolant color. You need to make sure you are adding the correct coolant. Look into the coolant overflow tank and you will see a tab sticking up. They call it a bridge. Coolant is to be filled to the top of that tab/bridge. Check and make sure your windshield washer fluid reservoir is also filled. Something in the back of my mind tells me somehow the two can get linked when the dash light comes on.

 

Its more or less the same height as the separation line between the white plastic and black plastic of the reservoir, but as soon as you open the reservoir you will see the bridge that @machild mentions