My 2005 ml350 is losing antifreeze from some where. I can't find any sign of a leak or any drips on the drive way, but i'm up to adding a gallon a weak. I thought about a bad head gasket, but there is no sign of water in the oil. Any ideas?

 

Check the lower radiator hose at the radiator

 

I have the same exact problem and model Im gonna get my thermostat checked and let you know if you find a solution please let me know

 

Get under the car and check the front of the transmission and the trans pan. Coolant leaks at the rear of the engine drip here and evaporate, leaving coloured residue. You won't see a puddle on the ground.

 

Im gonna check thanks