CLKAMG500

Ive noticed that if i drive for about two days, i will get a malfunction saying to check coolant level. Once checked, i notice that the reservoir , which was once full, is down midway. Basically, i can empty the reservoir in 3 days. when driving, the oil pressure is fine.... What other issues could be causing the sudden lost of water?

dfrois

It's a small leak, but it will get bigger. They always do. Get an ultraviolet light, and look for signs of leaks around and below the engine, in the dark. Most coolants will glow in the dark with UV light. If not, there's an UV additive for coolant that can be used to find leaks. The flashlight can also be used for AC leaks.