I can think of one... some of us elder GP lovers can't stand the compressor running in winter. GM set it up to stay off below 37 degrees but for those of us who don't jam out much, the sound can be annoying since its almost as loud as the whole rest of the engine. I let mine run until I think to turn it off with the button because it does help keep the system's lubricant distributed throughout the system and a lot of compressors used to go bad from going dry due to little use in winter.