Question about 1996 Oldsmobile LSS

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98 Bravada blows hot air out all the time

I have a 98 Bravada, and very hot air is
coming out of the floor air ducts, no matter what I do. It
doesn't matter if the fan is on/off, whether the temp is set to
cold/hot, and whether or not the system is set on auto.
Anyone have any ideas? Thanks.
Mandy

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  • 353 Answers

Check for a vacuum leak at the actuator under the hood

Posted on Jun 24, 2009

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Heating system only blows out hot air through the vents


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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).
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. 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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