1991 300ce HVAC Heating Problem

[drayper]

Hello all, I'm not getting any heat to my system with the temperature turned fully up and the fans on max in my 1991 300ce. I tested the heater valve and found it to be faulty, so I changed out my heater control valve with a newly tested replacement. However, after installing the new heater control valve I'm still not getting any heat. The new valve test good but still no heat at normal operating temperatures, just cold air. The hoses running to the valve from the water pump/engine are hot, The valve is hot, the two hoses from the valve are hot, but right before the one hose connects to what I believe is the metal heater core line going into the cabin, it gets cool like the coolant is not running any further. Does this sound familiar to anyone and can someone point me in the right direction. Thank you much for these tech articles.

Dray