Hi Scotty, My 2007 mazda 3 is making a strange rattling noise when the car is idling. i took a…

Hi Scotty,
My 2007 mazda 3 is making a strange rattling noise when the car is idling. i took a stethoscope to is and it seems to be a bad bearing coming from the alternator, however i have noticed the rattling goes away when i turn ON my AC. could this still be the alternator or is it more likely to be the AC compressor?
Thanks,
Giancarlo

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