Ok similar situation as my other coolant thread. But now my car will overheat if I don't have the heater on full blast. Work that I have done on the car in order from most recent. coolant flush, oil change, thermostat, head gasket, in the past two months. Timing belt and water pump last spring. I am really at a loss as to what the problem could be. All I can think of is bad thermostat, water pump, head gasket, clogged radiator or cooling system, and trapped air.