Question about 1999 Buick LeSabre

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Wont shut off

Ac constantly blowing

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Since it depends what parts were used to complete what system on this car, a/c systems are like that, i can suggest removing the (pressure cycling switch) and bench testing it for a compressor running all the time. the theory being, if it hasnt been touched, it may fail in the closed position.. if it has automatic temperature control, computer controlled, you can get a code from its memory for both (high blower always on) and or (system wont come off max cool). i have seen ambient temp sensors out of range, or blocked. interior temp sensors out of range or blocked, system overcharged, and if i think some more there may be a few others.
the first thing to do is goto a very reputable shop and ask if they can identify the system by looking and solve it quickly. a basic performance test and evaluation is a low cost menu item at most shops. write down what they answer your questions with so you can look it up for yourself in the event you need to.
libraries have tsb/recall info for free in their automotive databases, but a reputable shop should have a decent answer for you in the first hour or less. in my experience a gm dealership is the most reputable shop for you to ask. they can access the code memory if so equipped and follow the factory guided pinpoint tests. factoring in ,after i.d., what a quick list of causal parts may be for your car. and advise prior to spending more than you are prepared to spend. they have to see it and try a few simple things at least, to begin the answer process.

Posted on May 16, 2014

  • Ryan Williams
    Ryan Williams May 16, 2014

    I just really need to know where the fuse is the interface went out and none of the buttons will work and the temp don't show up. But the ac is constantly blowing cold and I just really want it off because it is cold out

  • dan lincoln May 16, 2014

    sounds like an electronic automatic temp control vehicle. if you stop the blower you may have trouble clearing the windows under some conditions. used parts may help from the u-pull-it yard to correct the problems. theres a relay center under the hood that may help you decide what circuit you want to cancel, or just unplug the pressure cycling switch on the accumulator. then when you can, get it looked at by a tech

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