Question about 2001 Chevrolet Silverado 1500

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Heater on my 2001 chevrolet silverado will not shut off. I can shut truck off and wait a few minutes and it will unstick. What kind of switch or valve is sticking and how do you repair it yourself?

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  • explorerspor Aug 24, 2010

    How do you repair or replace the blender door and where is it located. Is there a illustration to show how to do this.

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On the firewall there is a valve that opens to allow coolant into the heater core to provide heat. This can stick.
Otherwise there is a blender door in the venting itself. This door can stick allowing only warm air and no cold air.
If you are having problems with the blower motor not turning off when the truck is shut off, then that would be a sticking relay under the hood. The relay will have to be replaced.

Posted on Aug 24, 2010

  • Nate Stansfield
    Nate Stansfield Aug 24, 2010

    The blender door is actually a pain to get to.


    1. Remove the driver side knee bolster. Refer to Knee Bolster, Insulator, Molding Replacement - Instrument Panel in Instrument Panel, Gages, and Console.

    2. Locate the air temperature actuator (6).

    3. Disconnect the air temperature actuator electrical connector (7).





    1. Remove the air temperature actuator bolts/screws (1).

    2. Remove the air temperature actuator (2).

    3. Remove the air temperature actuator lever (3), if necessary.


    1. Important: The actuator lever can only be inserted into the door one way.


    2. Install the air temperature actuator lever (3), if necessary.

    3. Install the air temperature actuator (2). Notice: Refer to Fastener Notice in the Preface section.


    4. Install the air temperature actuator bolts/screws (1). Tighten

      Tighten the bolts/screws to 1.2 N·m (11 lb in).



    5. Connect the air temperature actuator electrical connector (7).

    6. Install the driver side knee bolster. Refer to Knee Bolster, Insulator, Molding Replacement - Instrument Panel in Instrument Panel, Gages, and Console.

    7. Re-calibrate the actuators. Refer to Actuator Recalibration .
    Actuator Recalibration



    When replacing the HVAC control module, it will be necessary to allow the HVAC control module to perform a calibration process.

    When installing the HVAC control module, be sure to perform the following:





    Important: Do not adjust any controls on the HVAC control module while the HVAC control module is self-calibrating. If interrupted,

    improper HVAC performance will result.

    1. Place the ignition switch to the OFF position.

    2. Disconnect the scan tool.

    3. Install the HVAC control module.

    4. Connect all previously disconnected components.

    5. Start the vehicle.

    6. Wait 40 seconds for the HVAC control module to self-calibrate.

    7. Verify that no DTCs have set as current DTCs.
    When replacing the HVAC actuator it will be necessary to allow the HVAC control module to perform a calibration process.

    When installing the HVAC actuator be sure to perform one of the following:



    Important: Do not adjust any controls on the HVAC control module while the HVAC control module is self-calibrating. If

    interrupted, improper HVAC performance will result.



    Preferred Method (w/Scan Tool)


    1. Clear all DTCs.

    2. Place the ignition switch in the OFF position.

    3. Install the HVAC actuator.

    4. Connect all previously disconnected components.

    5. Start the vehicle.

    6. With the scan tool, initiate the Motor Re-calibration feature of the Heating and Air Conditioning Special Functions menu.

    7. Verify that no DTCs have set as current DTCs.
    Important: Do not adjust any controls on the HVAC control module while the HVAC control module is self-calibrating. If interrupted,

    improper HVAC performance will result.





    Alternate Method (w/o Scan Tool)




    1. Clear all DTCs.

    2. Place the ignition switch to the OFF position.

    3. Connect all previously disconnected components.

    4. With the Mode knob in the PANEL position, press and hold the AC button for 5 seconds.

    5. Rotate the Mode knob fully counterclockwise.

    6. Rotate the Mode knob fully clockwise.

    7. Rotate the Mode knob fully counterclockwise.

    8. Release the AC button.

    9. Wait 40 seconds for the HVAC control module to self-calibrate.

    10. Start the vehicle.

    11. Verify that no DTCs have set as current DTCs.

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