blackhouse

I'm losing coolant fast ...I have a small pin hole leak In Radiator but that can't be it....I filled up the tank reservoir and drove for 20 mins and the check coolant level back came on ..hopefully not a blow head gasket or something real bad. If anyone has any ideas will be much appreciated....oh also no puddles of fluid on the ground either so it must be getting burned off somewhere ...thanks in advance

ambit

https://mbworld.org/forums/clk-class...e-petcock.html
Mine was a leak about 2" above the drain valve. Throwing some 'stop leak' worked for a bit till I replaced the radiator.

Rudeney

I think you'd be surprised at how much coolant you can lose with a small radiator leak.

gaazmon

I had a small leak at the nozzle that comes out of the coolant reservoir and connects to the hose. Very small break, but yes it would leak fast once the coolant gets heated up to operating temperature and starts evaporating.

Kelvin Bellrose

I kept getting a low coolant alarm, and could smell vaporizing coolant. I ordered the cheap expansion tank that included a cap and level sensor for like 60 or 80 bucks from FCP Euro.
Haven't had a problem since.
Made in China, but it seems just fine and the build quality is equally sound.