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2001 chevy suburban: malfunctioning heating..warms..It stays full hot

Customer Question

I have a 2001 Cevy Suburban with a malfunctioning heating & A/C system. Several times I have had the heat on then as the day warms up, tried to turn down the heat. It stays full hot regardless of what I do. A/C on or off makes no difference. When it sits over night then it will go back to proper operation. It takes several hours to recover. Just recently this occured and after sitting for four hours it still would not recover. It took over night. I have a friend with a newer Chevy Suburban that is having the same malfunction.
Submitted: 5 years ago.
Category: Chevy
Expert:  Chevy replied 5 years ago.
HiCustomer Thank you for asking your question on JustAnswer.

It seems like the blend door actuator.... They're know for problems in GM vehicles.

  1. Remove the floor air outlet duct extension from the floor duct.

    Click image to see an enlarged view

    Fig. Remove the floor air outlet duct extension (1) from the floor duct (2)

  2. Disconnect the electrical connection at the blend door actuator.

    Click image to see an enlarged view

    Fig. Blend 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.

    Click image to see an enlarged view

    Fig. Remove 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.

    Click image to see an enlarged view

    Fig. Blend door actuator and related components

  4. Install the floor air outlet duct extension to the floor air duct.
Chevy, Chevy Mechanic
Category: Chevy
Satisfied Customers: 451
Experience: 15 Year as an auto mechanic and technician.
Chevy and 10 other Chevy Specialists are ready to help you
Customer: replied 5 years ago.
Are you saying the blend door actuator needs to be replaced, or can it be repaired?
Expert:  Chevy replied 5 years ago.
Most likely replaced.
Expert:  Chevy replied 5 years ago.
Also make sure the AC system is charged with the right amount of freon

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