Question about 1991 Ford Escort

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No heat after changing thermostat.

1991 ford escort 1.9 engine. I changed the thermostat and still have no heat. The temp guage does not go past "C". I will get heat very rarely and the temp guage will work then. If I shut the car off, I have no heat again. Any ideas that I can try without pulling the heater core? Is there a way to test the heater core without pulling it out?? Please help since I don't even have defrost and it is snowing!!!!

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  • Jeff Poss Dec 16, 2008

    Thank you, is there any chance it might be a sensor or heater core valve or something like that?

  • Jeff Poss Dec 17, 2008

    I'm not sure about the cooling fan. It wasn't running under defrost but I never tried it under the air conditioner. I will have my wife try the cardboard. Yeas there is air flow and the top radiator hose is hot after running. Is there vaccum lines leading to the contol cluster in the dash (inside)? Autoxone told me to check those but I don't know if there are any. I thought it would only be linkage.

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Remove the heater core lines the two hoses that go to the heater core, take a splice tube either metal our plastic your part store will have either one. take the splice tube and install it in one of the lines add some hose to that tube make the hose long enough to run out side of the engine compartment and on to the ground. take the other hose and install a flushing tee, hook up to a garden hose and trun the water on . what you are trying to do is flush the heater core , you are also looking for blockage off the heater core, if you little to no flow i would suggest replaceing the heater core

Posted on Dec 16, 2008

  • kevin carpenter Dec 16, 2008

    there is no pure say heater core control valve, there was at one time a check vavle in the retrun side.but that would not stop the heat. do you have flow? is the cooling fan operating and what i mean is the rad getting hot from top to bottom you may have an issue with no flow through the rad our the water pump not pumping moving the the coolant. take a peice of card board and cover the front of the rad let me know glad to help

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SOURCE: no heat after changing thermostat

i mean heat and cooling for the seat, which control are on the door

Posted on Dec 16, 2008

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