Question about 2001 Buick LeSabre

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Temperature of A/C or Heater will not change to hot or cold. It is just kind of stuck in between. Door Blend Actuators are not moving but can be moved freely by hand. I have checked all the fuses and relays, changed one of the door blend actuators and changed the Temperature Control Module on the dash. Water is circulating and have installed a new thermostat. I have also disconnected battery to reset computer memory. Blower motor works fine and airflow can be changed from floor, vent and defroster positions just fine. Any Other Suggestions?

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  • 2 more comments 
  • reidjr Nov 10, 2010

    I have replaced the "A/CHeater Control Assembly" part/model # 25728330. Is that the part you are refering to ?

  • reidjr Nov 11, 2010

    I will check the cables and connections this weekend and get back to you.

  • reidjr Nov 16, 2010

    I have checked the cables and connectors. They are all secure. Do you think I may have overlooked a relay or fuse. Do know which specific relays / fuses I should check ?

  • reidjr Nov 20, 2010

    Still trying, give me a few more days.

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  • Buick Master
  • 11,800 Answers

Since all mechanical parts are in working order then the problem is in the logic part - the blend doors don't move because they aren't commanded to do that. The only thing that would do that is the failure of the climate control module - you will have to replace it.

Posted on Nov 09, 2010

  • 1 more comment 
  • Azrael SRL Nov 10, 2010

    Yes, this is it. In that case the control cable to the actuator isn't connected. But have you checked the cable itself?

  • Azrael SRL Nov 16, 2010

    There is no relay for that, just the fuse that powers the entire system , but since all the other adjustments are working it can't be it. Take the unit out but leave it connected, start the car and wait for it to reach normal temp, now press and move the commands and watch what those commands are doing - if nothing happens then the control unit that you just installed is either badly connected to the car or defective.

  • Azrael SRL Nov 20, 2010

    I'm not going anywhere; i'm still here.

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