ilijaneli, green coolant is a no-no for MB automobiles. Once you have the leak fixed change to genuine MB coolant (amber color). If you are not a DIY'er best to take your MB to a knowledgeable, independent MB-trained tech to diagnose the source of the coolant leak. It could be lots of things ... leaking water pump, leaking hose, loose hose connection, etc. Best to have it repaired immediately before you end up stranded somewhere or overheat the engine.

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Fred Hoelzle