Electrical or computer problem. temp gage and A/c don't work on 2007 Chevrolet Malibu

3 times in the last 6 weeks when turning on the A/C or defroster, I assume some computer problem occurs b/c the temp gage goes to 0(does not), the A/C does not blow cold air and on 1 occassion the engine check light came on (the time my wife turned on the defroster). and also I beleive the radiator fans automatically kick on. So far when i have disconnected the car battery and re-connected the battery the temp gage and A/C will work. No other problems with the car at this time. What is causing this? Sensor, the computer? How can it be fixed? i will go out and disconnet the battery a 3rd. I did not check for the diagnostic code when the problem happened the 2nd time. 1st time and the last time the service engine light did not come on

by in La Place, LA on May 19, 2012
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