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Q: Air Conditioner Compressor Turns Off and On by Itself on 2002 Chevrolet Malibu

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I have a 2002 Chevrolet Malibu with recurring air conditioner problems. The air conditioner compressor shuts off by itself and comes back on by itself. My dealer first showed me a bulletin stating that cycling was normal to keep the unit from freezing. But I proved to them that was not applicable to my problem because it would occur when I first started the car during warm mornings here in Florida. Chevy replaced the controller, which helped briefly. But it's been getting worse again to the point where it very frequently turns off during hot weather and especially at lower fan speeds (though this also varies). Any suggestions?
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The only way I can see to properly diagnose this problem is to monitor the A/C data at the powertrain control module (PCM) and the body control module (BCM) using a scan tool while the problem is occurring. Looking at the BCM and PCM data items will allow the technician to begin to isolate the cause of the fault. Due to the complexity of the A/C controls in your 2002 Chevrolet Malibu the scan tool is necessary to help determine the area of the A/C control system that is causing the fault. Once the area of the fault is determined more isolated diagnostic procedures and be used to find the exact cause to the problem.
It sounds like you have a low refrigerant problem. I would take it in and have it checked for a refrigerant leak. If there isn't one present, then your accumulator's desicant bag might be bad leading to too much moisture in the system. I would have the accumulator replaced and the recovery and recycle should be part of the labor. If your still experiencing problems have the electrical checked, but more than likely it's a refrigerant leak, which means you should have the accumulator replaced anyways when the problem is fixed at your a/c shop.
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