I have a 1991 Ford Taurus with almost 200K miles that is still running well so I use it for my commuter car. Recently, I have noticed my heater/defroster does not generate any heat at all. The heater fan simply blows normal air. I replaced the heater core less than a year ago and it worked fine until just recently. I have also replaced the water pump and radiator recently so I know for a fact the thermostat is working correctly, and the radiator has the proper amount of anti-freeze. Does anyone have any suggestions of how to troubleshoot this problem?
Thanks in advance,