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Buick Forum: 1997 lesabre heat issue
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  1. #1
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    1997 lesabre heat issue

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    Hey all. I got this car in december. It has the dual climate control. When I got the car, the screen on the hvac display wouldn't light up, and none of the buttons did anything. I got a used unit from a junk yard, and then the display worked (but still no lights on the buttons?) So, I then realized that only the drivers side had heat, the passenger side was cold. I got around this by turning the temp all the way to cold, then back to hot, and it worked most of the time. After doing some reading on this programmer, I started testing. I found that all of the vacuum lines going to the programmer had vacuum, so I replaced the programmer with a used junkyard unit. Now, the car still does the same thing. Am I overlooking an actuator or blend door or something? I'm at a loss. Could this programmer be bad also? I'm ready to pull my hair out.

  2. #2
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    Re: 1997 lesabre heat issue

    Also, I do get a blinking display on the hvac controller when I first start the car. I've tried to unplug the temp sensor and plug it back in after 5 min of having the car run but that didn't work either.

  3. #3
    ryenie is offline Full Member My Buick(s): 95 Monte Carlo L36
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    Re: 1997 lesabre heat issue

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    The blinking is to indicate a fault in the system, i think more specifically an error in calibrating the blend doors, but it could just be there's an issue with the a\c system, not really sure. If the temperature is not coming out the same on both sides when both sides are set to the same temp i would say it's the passenger side blend door actuator. It could be a broken gear in the actuator or rounded off peg for the blend door where it goes into the actuator, or debris keeping the door from having a full range of motion. If there were no issues found there then i would take into consideration the controller, but i would investigate the blend door actuator.

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