Question about 1999 Ford Taurus

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Heater blows cold air have replaced the thermostat

I have a 1999 ford taurus that the heater blows cold air have replaced the thermostat and flushed the core several times with limited results

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  • billyblazes2 Sep 08, 2009

    yes they both get hot. I will have to look into the blend door. is there a way to tell if it is working properly? I was also going to try replacing the water pump.

  • hwymotors May 11, 2010

    do both your heater hoses going into the firewall to the heater core get hot? if they are both hot the problem is probaly in the blen door or the controls to open the blend door

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  • 104 Answers

Sounds like the controller went bad use temp checker see what your temp is at inlet of heater core from hose

Posted on Sep 08, 2009

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1999 Ford Taurus, no heat. Air comes thru all vents but blows cold air like the ac is on. Replaced thermostat twice, flushed heater core three times (just did it), still ice cold air. Both pipes going into...


ford you say


check that there is flow coming out your heater hoses
step 1 remove 1c heater hose
step 2 have a friend start car remember it is easy to install a heater flush valve and it makes the job easier
if there is flow then eithor you have a blockage or an air lock
if there is no flow there might be a valve in the heater lines to stop the flow of coolant to the car when ac is on i have seen theise in a few cars but they are rare if there is a valve than make sure it isnt frozen with rust and ir does work in a ford i would assume that it is a vacume valve

good luck and happy hunting

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1 Answer

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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

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feel the two hoses going into and out of the heater core. they both should be hot. if one is cold the heater core is likely plugged. you can try flushing it out to see if you can restore flow to the heater core. if they are both hot the thermostat may be sticking open tho you should have a limited amount of heat. also confirm that the vents are operating as they should be.

robert

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Taurus does not use a heater control valve. It runs coolant thru the heater core constantly. You may have a temp blend door actuator problem or a plugged up heater core is also very common. Feel the heater hoses, they should both be very hot, it one is much cooler; you can try to back flush the core.

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1 Answer

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..

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