Question about 2005 Chevrolet Malibu Maxx

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The HVAC does not switch from cold to hot. Seems like the temp control door is not moving. Air conditioning is working fine. the inlet and outlet hoses at the firewall are both hot.

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  • Anonymous Sep 15, 2008

    The heater hoses are hot and the temperatyure gage shows normal. However, turning the temperature knob to hot does not give any hot air. I did observe one thing that I don't know whether it is normal or not --- about 5-8 minutes after the car was turned off, I heard noises under the dash that seems the motor wants to close/open some doors. Is this the temp door?


  • eagor_aaeaga Oct 24, 2008

    I am having the same exact problem. I never noticed the noise in the dash untill the heat quit working. I will tell you that it is NOT the thermostat I changed it myself and it didnt help...

    However Yahoo answers said it might be a temperature valve actuator. If anyone knows where this is located please help.



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The location of the blend motor on my 2005 malibu is on the driver side, near the center consol, not easy to get to. Before you try to remove the blend motor, unplug the wires it, turn the temp knob to cool side, disconnect the pos side of the battery for a couple of minutes. Reconnect the battery, plug in the bend motor start the car and turn the temp control to heat side. If this does not work remove the motor and repeat. the motor my be jamed. I had the same problem, this might be a cheaper way to fix this instead of the dealer. PS if you remove the blend motor, be carfull to look at the orientation of the spring on the shaft of the door in case it pops off.

Posted on Aug 04, 2009


Where is this blend door? How to access and check for mulfunctioning? Thanks in advance!

Posted on Sep 20, 2008

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The blend door is controlled by an electric stepper motor, very likely the motor is defective or the door is stuck.

Posted on Sep 05, 2008

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I would look at the air blend doors first, it sound like they are not working or your control in the dash is not working send a signal to them. they work by changing the air from hot to cold or in between.

Avalanche, Sierra And Silverado
  1. Remove the floor air outlet duct extension (1) from the floor duct (2). 0900c152801c9c8a.jpgRemove the floor air outlet duct extension (1) from the floor duct (2)
  2. Disconnect the electrical connection at the blend door actuator (10). 0900c152801c9c8b.jpgBlend door actuator and related components
  3. Remove the blend door actuator mounting screws from the HVAC module.
  4. Remove the blend door actuator as an assembly with the actuator cam. 0900c152801c9c8c.jpgRemove the blend door actuator mounting screws from the HVAC module
To install:
  1. Install the blend door actuator as an assembly with the actuator cam.
    1. Line up the heater/defroster valve lever with the blend door actuator cam slot.
    2. Line up the A/C valve lever with the blend door actuator cam
  2. Install the blend door actuator mounting screw to the HVAC module.
    1. Tighten the blend door actuator mounting screw to 14 inch lbs. (1.6 Nm).
  3. Connect the electrical connection at the blend door actuator (10). 0900c152801c9c8b.jpgBlend door actuator and related components
  4. Install the floor air outlet duct extension (1) to the floor air duct (2).
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  1. Disconnect the electrical connector to the mode actuator that is located on the left side of the air distribution case.
  2. Remove the screws.
  3. Remove the adjuster links from the control lever.
  4. Remove the mode actuator.
  5. Adjust the mode actuator by completing the following steps:
    1. Connect the electrical connector to the actuator.
    2. Turn the ignition switch to the RUN position. Allow the self-positioning of the actuator.
    3. Turn the ignition switch to the OFF position.
    4. Remove the actuator from the electrical connection. 0900c152801c9c8d.jpgBlend door actuator-C/K Series
To install:
  1. Install the mode actuator.
  2. Install the screws.
  3. Install the adjuster links to the control lever.
  4. Connect the electrical connector.
  5. Test the circuit operation

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