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Is the ac supposed to cycle on a 2000 Chevy Malibu?

Yes, the AC compressor in a 2000 Chevy Malibu (and most modern vehicles) is supposed to cycle on and off. It doesn't run constantly. The cycling is controlled by the system's pressure switches and temperature sensors to maintain the desired cabin temperature and prevent damage to the compressor. If it's running constantly or not at all, there might be a problem with the system.