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Question
With AC on display shows Refrigerant low AC compressor shutting off. Mechanic has checked freon. Plenty there. If I unhook battery it resets and workd for about 20-30 minutes and then does again.

Answer
Hello

Whenever there is a low freon issue the compressor automatically shuts down to prevent damage to the compressor occurs.
You state everything on the car is linked into the computer system and it is possible you have your mechanic has checked the freon and there are no issues there.
Have you had the vehicle scanned for trouble codes with a GM Tech II or equivalent? Being everything is linked through the computer, the possibility that you have a bcm (Body Control Module A/K/A computer) issue exists. There should be a diagnostic code present. Disconnecting the battery and connecting again only does a temporary reset and only masks the problem temporarily.
This problem appears to be electronic. Either a sensor has failed or the problem goes back to the computer. You do not need to go to a dealer to find the problem. The larger service centers can assist you i the diagnoses.

Good Luck!

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Rob Painter

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Alarm system questions cannot be answered on this forum. These systems are not what I can answer. Without being physically at the vehicle and not knowing what kind of electrical service has been done on the vehicle, there is no possible way to give an accurate answer over the internet. My expertise is in Ignition/key based anti-theft systems. These issues include GM VATS (resistor chip in key blade) PASSLOCK (MRD)-ignition lock rotation based, no special ignition key and the PKIII Transponder (computer chip in key) systems. These systems are not alarm based and are integral with the starting of the engine. This is why I cannot diagnose alarm problems without physically looking at the vehicle: Alarm systems are a completely different annimal than ignition key/lock based anti-theft system. Many alarm questions come from vehicles 10 years old, and since older, many hands that had been involved over the years.I am an expert in all GM factory (ignition/key based)systems. Alarm system questions pose to many situations beyond my knowledge as to what has been done to the vehicle over the years. Some guy may have actually wired the stereo into the alarm system. Who knows? Over my past 30 years in vehicle wiring repair, I have seen unbelievable wiring disaters done by guys that consider themselves "mechanics." I have seen stereos and alarms intalled using surgical tape. I have seen modules burn up, un-fused circuits, wiring jambed between the doors and even lamp cord used for a starter kill. To answer alarm questions over the internet without examining the vehicle is like asking; What does it take to remove a dent?

Experience

Education/Credentials-ASE certified. 11 years with a GM dealer and 17 years with a repair facility dealing with only the repair of theft recovered vehicles.

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