Question about Chevrolet TrailBlazer EXT

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The rear heat is not warm, but the fan works. the rear A/C has the same problem

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  • Robert ( Bob ) Sevigny Nov 07, 2010

    yes the front heat and defrost is great. 2004 6 cyl. trailblazer with rear heat

  • Robert ( Bob ) Sevigny Nov 07, 2010

    I will get the info this afternoon when my daughter comes over with the car. Thanks

  • Robert ( Bob ) Sevigny Nov 07, 2010

    Yes 2nd and 3rd row seating ext model. production date is 10/03

  • Robert ( Bob ) Sevigny Nov 09, 2010

    Some how i lost the latest e-mail; some thing about removing fuse and the key in the on postion to reset the controls. would you resend that info?

  • Robert ( Bob ) Sevigny Nov 10, 2010

    I did get the last reply; I will try that tomorrow night when she bring the car over. It does sound like a good place to start. Thanks; I will keep you posted.

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What is the year, make, model and engine size? First thing would check is coolant level.If level is ok check the radiator hoses to see if one is hot and the other is cold or just slightly warm. The thermostat may be stuck open.

Posted on Nov 07, 2010

  • 6 more comments 
  • Jonathan S
    Jonathan S Nov 07, 2010

    Sorry about that reread your question only the rear heat is affected front is working ok?

  • Jonathan S
    Jonathan S Nov 07, 2010

    when you try and adjust the rear heater controls do you hear clicking and or heater just stuck in one position?Are you able to still adjust the rate of airflow out of the heater just not the temperature?

  • Jonathan S
    Jonathan S Nov 07, 2010

    Is this an ext model which has 2nd and or 3 rd row seating also will need to know production date which is located in the driverside door on the placard?

  • Jonathan S
    Jonathan S Nov 07, 2010

    Let's attempt to reset the rear HVAC controls prior to to anything else.Many times this reset will and correct current issues with the rear HVAC system.

    With the key off remove the HVAC B fuse located underneath the rear seat on the driverside for a minimum of 10 secs.Would suggest 30 sec then reinstall.Turn the ignition key to the run position but do not touch any HVAC controls the system relearn process takes about 40 sec but would give it about a minute prior to using any controls. Let me know if this helps or not as we may need to move on to an actuator or HVAC module issue. Remember after replacing the fuse do not adjust any HVAC controls as this will disrupt the relearn process.

  • Jonathan S
    Jonathan S Nov 07, 2010

    Were you able to try the reset process?

  • Jonathan S
    Jonathan S Nov 09, 2010

    at the bottom of the page is a button to view more comments and clarifications.

    Let's attempt to reset the rear HVAC controls prior to to anything else.Many times this reset will and correct current issues with the rear HVAC system.
    With the key off remove the HVAC B fuse located underneath the rear seat on the driverside for a minimum of 10 secs.Would suggest 30 sec then reinstall.Turn the ignition key to the run position but do not touch any HVAC controls the system relearn process takes about 40 sec but would give it about a minute prior to using any controls. Let me know if this helps or not as we may need to move on to an actuator or HVAC module issue. Remember after replacing the fuse do not adjust any HVAC controls as this will disrupt the relearn process.

  • Jonathan S
    Jonathan S Nov 10, 2010

    were you able to see the additional posts with the view more comments at the bottom?

  • Jonathan S
    Jonathan S Nov 10, 2010

    not sure if your able to see these messages.scroll to bottom of page too see the veiw more comments.

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