McGowen

I have a lack of heat problem as well. Here are my symptoms. 1) The firewall mounted valve seems to be working. I can see it actuate when the heat is turned on. 2) The engine temperature goes to normal and does not overheat. 3) The heater works when the engine is running over 2000 RPM. 4) The heater goes cold at idle. 5) The thermostat has been replaced. 6) There is coolant in the reservoir, so I believe the system has plenty coolant. Any help would be appreciated. Thank you, C.W.