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?