Question about 2002 Ford Taurus

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Heater My heater will not blow hot air. I changed the thermostat but still have problem. My A/C works fine but just no heat. Any suggestions

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  • viralibiz Sep 17, 2008

    Exactly the same problem even flushed the heater core. When heater is first switched on warm air but promptly turns cool.

  • ydoj347 Sep 18, 2008

    To rlwalter--Thanks for the advice but could you tell me where these things are located. I'm definitely not a mechanic. lol thanks again for your help

  • ydoj347 Sep 26, 2008

    Thanks for the great advice. After following your instructions we found the valve is not working. Great website for help. Thanks again.

  • jamey6969 Oct 13, 2008

    heater blowing cold air only on my 2001 ford Taurus changed the thermastat already had a radiator flush done the heater core is working all the hases feel warm.

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I finally had my mechanic take everything apart and he found the door that switches from cold to hot in the heater box had broke and cannot be repaired. He told me a new heater box is around $500. I had him push the door to the heat side and stop it from going to cold. Can't afford the fix right now.

Posted on Nov 08, 2008

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Thanks for those suggestions. i did have a total radiator flush and tank replacement done 1 year ago on my 2002 ford taurus. after wards the mechanic let my wife know if i had any problems i might have to do with the heater core. i also dont get much heat. and when i do it usually is because we are at 30-60 miles per hour. it is slow to heat anyways. my thinking was heater core because of the gunk i had before it flushed. i did put radiator cleaner in and ran for a long while. i did a back flush and the water pump squeals but no leaking. i did take hose off of the tank on radiator side and blew into it and the pump quieted down. when presurized the flow from the tank is working fine. i just dont know if it is the heater core or the pump or the valve? as i was reading this article the tests of the hoses were the same. i know it is a long process to replace heater core and that is why i am on here is to get to a site thats free to get instructions on replacing the heater core incase these other techniques dont solve my problem. if any one out there has info where i can go i would be greatful. my wife can be like a heater blowing cold to warm air. not very pretty.not to mention the time to replace the heater. do i have to take something apart to access the vent valve to see if it is working?

Posted on Nov 07, 2008

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After the car is running for 10 minutes open the hood and feel the two hoses going to your heater core in the fire wall dash area. Are they the same temp?
1) Your temp should be set to high with blower on. If they are the same temp the water is flowing through the heater core. If you still do not have heat the problem is the vet door is not switching from AC to heat . This is located under the dash. THe selanoid door may je jammed, a wire may be off or a vacuum line off to that particular vent.
2) If the temp of the two hoses is different temp one decidedly cooler or hotter than the valve that send the hot water t the heater core is mal functioning. If it mechanically opens and closes this can be corrected by manually moving valve to open. Again if electrical or vacum - check for wire off or sticky vale. If the valve is bad replace it yourself with minimal difficulty.
rlwalter

Posted on Sep 17, 2008

  • rlwalter Sep 19, 2008

    I am answering your question as to the location of parts-only 2 heater hoses should be going to the fire wall of your car. One takes the hottest water from engine to the heater core and the other returns to the water to the engine to be "reheated". Usually on the passenger side of the car as if behind the glove compartment. The temp control valve is on the "in going" hose to the heater core in the dash. That is controlled by manual lever or vacuum hose I'm not sure on 2002 - but there must be a control valve. When air cond. is on the valve is closed and when heat is called for it is in the open phase. This can be checked by looking at the valve in heat and AC phase and also check temp of hoses in each phase. If heat is on full, with blower full speed, then both hoses should be almost the same very hot temp. If in the AC phase with blower on an AC on then only 1 hose will be hot.



    Flushing is not a bad idea but for a vehicle only 6 years old usually there is no clogging unless you have had other water pump problems or putt in dirty water or have not maintained the correct COOLANT MIXTURE OVER THE YEARS.



    Also when you are physically in the car, with windows closed and radio OFF - chang from heat to AC - do you hear the vents opening and closing under the dash?? If not there may be a vacuum leak. Listen for a hissing sound under the dash or it could be the main vacuum line from the engine usually going to the side of the carburetor. My way of checking for a vacuum leak is a very thin hose placed to your ear and the other end behind the temp control panel under the dash. The same for by the carburetor.



    If the BLEND doos do not open and close properly under the dash you will never get the heator AC you desire. See if any of these things work. Good luck. Usually it is a simple fix but much easier if I had my hands in or on it.

    Good luck!

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SOURCE: need to change thermostat

follow your upper hose from the radiator to the engine the thermostat should be thereat the end of the hose usually two bolts are holding it in loosen 2 bolt and see what way thermostat is facing cone into head or into hose take out and boil in water see if the spring retracts if it does the thermostat is not bad its something else

Posted on Oct 23, 2009

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SOURCE: heater wont blow hot air...new thermostat 1998

is the heater tap working to let water through the heater core it may not be opening have to check operation of that

Posted on Oct 26, 2009

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SOURCE: my in heater in a

You have a plugged up heater core. Try pulling the heater hoses of where they go into the firewall, put a garden hose with a spray nozzle in one hose and gently flush the system out. you will need to pull both heater hoses off to do this.

Posted on Feb 11, 2011

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