I have a c240 1999 w202 and I have a problem with my coolant level. I
have been using the vehicle for a year without having to top up coolant but
one day after traveling a 1000km the coolant level light came up and when
I checked I realized it had gone down to just below the half level. I topped
up with a liter of coolant and another of water. since then I have to top it at
least once a week yet before this I had gone for almost a year without the
level changing what could be the problem, it seems the are no visible
leaks. please help.
You have a leak somewhere. Maybe the leak is small enough that the coolant is evaporating. Perform a pressure test to verify.
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