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Car heater does not blow hot air ....already replaced the themostat,flushed the raditor,added coolent,and changed the blower fan ,checked all the fuses..what is the problem??? could it be anyhting else but a new raditor ??? car is a 1999 ford taurus se
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Assuming that you have the proper amount of coolent added, check where your heater hoses connect to the engine block for rust and corrossion, this is a common area to clog up, preventing coolent flow from circulating through your heater core. If ok, check for a thermostat that is stuck open.
leave the coolent cap off the resevior and run car up to temperature this should get all air from the system BE CAREFULL U WILL GET BURNT!!! STAND WELL BACK AND BE READY TO SHUT ENGINE OFF as soon as the coolent starts to bubble turn engine off and leave to cool before replacing cap, start engine again with cap on drive for a little while untill the temp gauge shows warm and check that the fan in engine bay is working have heater blowers in car on all the time whilst doing this operation!
Make sure that the radiator fan is going off like it is suppose too. Also, some vehicles have a shut off on the water inlet hose to by-pass the heater core for the A/C when it is running in the summer. This could be malfunctioning.
The blend door that regulates the airflow over the heater core may be stuck in the AC position. It is inside the case and is most difficult to get to. There may be a YouTube video that may help you locate it and test it.
Sounds like Heater matrix blocked, check pipes going from engine bay into bulk head both should be getting hot if one is not then may be worth removing pipes and trying to flush it through as would be expensive to renew it as its a large job.
How often has the coolant been changed? My only guess is that it hasn't and the hoses and the heater core are plugged up with goo and a flush is needed
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