Mercedes-Benz W163 cooling system leak and bleeding
ML 320ML 270 CDI
Mercedes-Benz W163 is dripping coolant, how do you find the leak?
Pressurise the cold cooling system to a good bar with a rubber plug that tightens in place and a pressure gauge. Listen for where it hisses. This also finds a leak you could not otherwise see.
What is a common leak point near the expansion tank?
The lower hose connection at the expansion tank, where the hose has hardened. The end of the hose can be shortened by a couple of centimetres, which may stop the leak. A leak from the lower radiator hose can also be fixed by removing the hose and refitting it.
How do you bleed the Mercedes-Benz W163 cooling system?
There is no bleed screw or water valve. Fill the coolant, squeeze the upper radiator hose and run the engine with the heater on full. Put the cap on when the level in the expansion tank no longer drops and there is the correct amount of coolant.
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