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Thread: 2005 tb no heat

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  1. #1

    Default 2005 tb no heat

    2005 TB dual climate control A/C works great, but only cold air comes out no matter what temp is selected.

  2. #2


    You could try recalibrating the blend door actuator: I found this discription,
    For manual systems it does not matter where the a/c controls are set but if you feel the need to do something, turn the blower switch on (I prefer speed 3) and set the temperature sliders about .5" to .75" from full cold.

    For auto systems, press the auto button, with the key on.

    Turn the ignition off.

    Remove the HVAC/ECAS , 10 amp fuse in the underhood fuse box* or disconnect the battery for one minute.

    Install the HVAC fuse or reconnect the battery.

    Start the engine. On systems with auto a/c controls the controls will default to 74 degrees F when the ignition is turned back on.
    DO NOT TOUCH the a/c controls.

    Let the engine run for 1-4 minutes.

    Turn the ignition off for at least 10 seconds but no more than 30 seconds.

    Restart the engine and then test the a/c controls.

    Hope this helps

    1995 Silverado 4x4
    6" BDS Suspension Lift-3" Body Lift-Add A Leaf in rear -Trailmaster SSV Shocks-Duel Steering Stabilizer Kit -AirAid Cold air intake-
    4.56 Gears with Detroit Auburn Locker-Pro-Comp Traction Bars with duel shocks-Aluminum Skid Plate Kit-38.5" x 16.5" Mickey Thompson Baja Claws-Constant Dropping fuel gauge

    2005 Yukon XL Jet Power Programmer, Bilstein Shocks, Bilstein rear springs, Helwig Anti-sway bars, EGR Window Visors, EGR Hood Shield, Denali Headlights, Headlight harness upgrade, GE NightHawk Bulbs, White Night Rear lighting system, Russell Braided SS brake lines, PowerStop Brake pads, PowerStop cross drilled and Slotted Rotors,
    2002 Silverado ext cab 2wd (Sold)
    2003 Yukon XL (Totaled)

  3. #3


    Pikey is right, it might be blend door actuators; my '05 Envoy XL (prev truck) had the same problem one year. It was only low coolant level and, it did not look low. It took very little to bring the level back to the full mark, but the heat worked great after it was topped off.

    '09 Avalanche LTZ - Black
    '05 Envoy XL (sold)

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