Question about 2002 Jeep Liberty

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I have a 2002 Jeep Liberty Limited, 3.7 L motor. The heater will not blow hot air. The A/C and fan work well. When I turn the temperature dial to hot, there is only cold air coming out. Can you assist me?

Posted by Anonymous on

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  • Anonymous Jan 16, 2011

    Have you had any work performed on your cooling system recently? Some examples of cooling system work may include thermostat replacement, coolant hose replacement, radiator drain and fill or radiator replacement.

  • Anonymous Jan 16, 2011

    No, I have had no work performed on my cooling system. The only activity with my Jeep was when I jump my son-in-law off on New Years Day. I have had this problem since then.

  • poochie boo
    poochie boo Dec 10, 2013

    I've had a new themostat ,radiator and a flush and fill but my air still blows cool.Can you tell me why?

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dttech

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Jeeps are notorious for having broken temperature control (Blend Air) doors. A malfunctioning Blend Air Door actuator probably caused it to break. The dash will have to be removed to replacethe door and the door actuator.

Posted on Jan 16, 2011

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  • Anonymous Jan 16, 2011

    Thanks, I will work on removing the dash and chamging the Temp Control Blend doors.

  • dttech
    dttech Jan 20, 2011

    With the proper equipment, the doors can be tested to see if they are working or setting any fault codes in the computer without having to remove the dash. If this is done first, you will at least have an idea what the failure is and what to look for if the dash does need to come out...there may be a simpler solution....

  • Connie Conway
    Connie Conway Jan 04, 2014

    Can you tell me about how much a mechanic would charge to replace the temp Control Blend doors and actuator if that is the problem? Also if I continue to drive it without fixing it, will it affect anything else?

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ROBERT RIGGS

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YOU EITHER HAVE A PROBLEM WITH THE TEMPERTURE ACTUATOR OR LOW ON COOLANT OR A CLOGGED HEATER CORE IF YOU CHECK ONE SIDE OF HEATER HOSE INTO CORE AFTER WARM UP AND ONE IS HOT AND THE OTHER IS COLD IT IS THE HEATER CORE

Posted on Jan 16, 2011

Testimonial: "I will check heater hoses tomorrow, thanks. "

  • Anonymous Jan 16, 2011

    I really think you should focus on checking the basics before you delve into difficult diagnosis. You may have a broken impeller on the water pump. You may want to remove the radiator cap when cold and check for coolant flow with the engine running at about 2000 rpm's. If you can see movement of the coolant then the water pump should be OK. Also check to see if you feel any change in temperature at the vents with the higher rpm's. If it feels that it's trying to get warmer then you may have an air pocket. Even though you have not had any cooling system work done recently, the lack of service during the cold months could lead to the same symptom (contracting coolant in colder temps allows air to enter coolant system from overflow tank). Given that you first experienced this problem after trying to jump start another vehicle you may also want to check your fuses. Some vehicles have an auxiliary electric water pump to aid in flow for the heater core. Check to make sure that all fuses for you heater-a/c system are OK. Finally check to make sure the lack of heat is present in all vent settings. If the windshield vent or floor vent blows warm while the face vent is cool then you may have a blend door problem. REMOVING A DASHBOARD FROM A VEHICLE IS AN INTRICATE AND OFTEN DIFFICULT PROCEDURE! You should be sure that there isn't a simple solution before undertaking that repair.

  • Connie Conway
    Connie Conway Jan 04, 2014

    If it is the heater core, is this expensive to fix

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on all cars made
(you can read the FSM at any time and see exact way and tests)
1: damper stuck or its actuator bad. ( 3 kinds uses on all cars)
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ill post the calibration

quote

Use this procedure to ensure that the A/C-heater control is correctly calibrated to the blend door actuator. If the calibration is not correct, the heating-A/C system may experience a condition where full heating or cooling capabilities cannot be obtained.
Manual calibration of the A/C-heater control should be performed if the blend door actuator is not functioning properly, or if the temperature of the conditioned air is too warm with the temperature control in the full cold position or too cool with the temperature control in the full hot position.
NOTE This calibration procedure can only be started within the first ten seconds after the ignition switch has been turned from the OFF position to the ON position. Make sure that the battery is fully charged prior to beginning the calibration procedure. NOTE The length of the pause made at each end of the temperature control rotation (sweep) is important. 5 seconds) or too long (greater than 1.5 seconds).
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    • Rotate the control clockwise to the full hot position. Pause one second.
    • Rotate the control counter-clockwise to the full cold position. Pause one second.
    • Rotate the control clockwise to the full hot position. Pause one second.
    • Rotate the control counter-clockwise to the full cold position.

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