Question about 2001 Chevrolet Silverado

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Heating system only blows out hot air through the vents

Even with the A/C on, hot air continues to come out of the vents as if the temp guage was turn up as hot as it will get. Couldn't find any blown fuses. Is there a separate thermostat, other than the engine? Could the knob be stuck?

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  • 4 more comments 
  • hotrandyus Dec 07, 2008

    I have a 2001 chevy silverado hd 4x4 and even with the a/c on it still blows hot air

  • travisrjacks Apr 23, 2009

    i have a 2004 chevy trailblazer and the a/c will not blow out cold air just heat and the rear defrost and the A/C button will not work and it blow out only the front and at the windshield

  • Anonymous May 17, 2009

    Heating cooling systen blows out hot air .Im going to change the acuater as I understand this is another planned obsolence part. Made only good enough to last through the warrenty period. I read of a gentleman who has had to replace two of these already

  • Anonymous May 26, 2009

    Air Blows thru the windshield and floor ducts only. It won't blow air straight thru the dash ...

  • robin jegede-brimson Sep 13, 2013

    yes the knob is indeed stuck and keeps going back to hot .

  • Anonymous Mar 16, 2014

    engine hot air conditioner turn off light came on. I check the temp guage was reading 200 then guage droped to 160 reading.

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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). Heating system only blows out hot air through the  - 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 asHeating system only blows out hot air through the - 0900c152801c9c8c.jpgator 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).
    0900c152801c9c8b.jpgBlend door actuator and related components
  3. Install the floor air outlet duct extension (1) to the floor air duct (2).
C/K Series
  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. 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

Posted on Nov 28, 2008

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  • 115 Answers

Sorry, but after that explanation this may
seem a bit short,but when my car only blows
out hot air, l have the A/C refilled. ??

Posted on Sep 26, 2014

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