Question about Mercedes-Benz M-Class
You may have a leaking core or welsh plug. This is a large disk which is used to block off the holes left behind by the casting process during manufacture. They are easy to replace but difficult to access.. It may also be a leaking hose or even a cylinder head gasket but I would suspect a welsh plug first. Take the vehicle to your local garage and get them to pressure test the cooling system, this will show up the leak a lot easier..
Posted on Aug 02, 2010
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Posted on Jan 02, 2017
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· Leaky heater hoses
· Replace radiator cap if over 7 year old
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Overheat problem: (check in order)
· Leak has caused a large volume of air to enter engine coolant system and it needs to be filled back up.
· Cooling fan on radiator not working.
· Engine thermostat not operating.
I hope these suggestions help you find your leak and deal with your overheating problem.
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