Well I replaced my radiator and I lost heat, also the car smoked so I took out and replaced the water pump and therm. When I took out the water pump i saw a rubber stopper that clogged the water flow going back to the radiator. But even after replacing the water pump, the therm, and the radiator I still have no heat. The car doesn't overheat and thank god it doesn't smoke. But I don't have heat. this problem did happen when I just replaced the radiator. It happen a day later. How can I get heat back with out taking it to the dealer and spending $900 to get a new heater coil.