I have replaced the Water Pump and the Thermostat and it still blows cold air when you turn it to heat.
Unless it is the heater core which you should flush system,,i always boil my new thermostat to make sur it compresses
SOURCE: heater
Have the cooling system flushed or remove the hoses from the firewall(when cool) and blow out heater core with compressed air-clogged heater core..
SOURCE: heater blows cold air have replaced the thermostat
sounds like the controller went bad use temp checker see what your temp is at inlet of heater core from hose
SOURCE: 1999 Ford Taurus, no heat.
Try checking the two pipes that go into and come out of the heater matrix, is one of them hot? if it is there is an air lock within the matrix, Also is the thermostat opening fully? Sorry i know you said you have changed it twice already but take it out check settings when it should open and close, then boil some water and test the thermostat
SOURCE: 1999 Ford Taurus 3.0l EFI 6cyl, Heater does not
It could be air locked. Feel both your heater hoses, and, with the engine running, loosen the one that's cold, if there is one. If that doesn't help, it is probably your heat control valve that is malfunctioning.
SOURCE: heater blows cold air. I have replaced thermostat,
Not an expert by any means, but i know my ranger.. I had a small leak at the top of my radiator that still cooled the engine but didnt have enough pressure to get to the heater. The heater hoses travel up over the engine and just were not gettin anything to my heater core. That or make sure the heater control valve is operating.
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