Hello,
I have a 2001, E430. The check coolant light came on recently. Upon inspection I confirmed the coolant levels were at max. I assumed the light was simply malfunctioning. A few days later I began to hear large amounts of liquid sloshing around at the rear of the engine near the dash. This has happened on 3 occasions. Now, I find the heater is blowing cold air. Again, this does not happen all the time. The engine has not overheated and the car drives fine. I am assuming the coolant has become blocked near the dashboard area and is not making it to the heater core. Any thoughts?

could be heater valve,but check thermostat, and water pump.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran,you are a citizen of the world, all peoples are
cousin's, love all life, your love is enternal

The auxiliary water pump may have stopped functioning.

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Fred Hoelzle