tom70

Any help would be appreciated as dealer does not see leak.

Car was driven 20mins and then parked. In morning low coolant light came on and when I opened the hood coolant splatter was on engine and and inside of hood - had car towed to dealer.
Dealer could not locate the leak (did a pressure test - all was fine). Had the engine running for a while and no leaks as well.

Has anyone else seen anything like this as I want to get my car back ASAP as it is brand new with only 4,000 miles.

petee1997

My car is at the dealership for exactly that problem. The first three times I was there, service could not find a leak but would add a few ounces of glycol and the light would turn off.

This time they found the leak near the timing cover. Glycol was running into the motor oil and that is why they could not find the leak.

They told me it would take two to three days to repair.

tom70

Dealer called and advised me they found the leak and it is coming from the Return Line Valve (no clue what it is or where it is). They are getting the part in tomorrow and they have no idea how long it will take as they never did one of these.

Anyone with mechanical knowledge know anything about a return line valve on a 2014 CLS 550?

petee1997

Correction: Now dealer says leak was from faulty cooling system cap. It has been replaced. We will see if that is the solution.