Ive been having an ongoing problem with my cooling system in my car since the new year started. Ive already replaced the thermostat and the water pump. But it runs fine, the heater works, until you start moving down the road. then the heater quits and it starts overheating again. Im so confused, I've never had a car do this. Maybe air in the cooling system still? I dont know. Any suggestions on the best shop in town to take it too? i just dont want to spend a fortune. ive already dumped sooooo much money into my car lately.