ANSWERS: 2
  • Possibly that or a loose belt.
  • It's not your alternator. Check your belt tensioner, and ensure your belts are in good condition. I've never heard of an alternator making that noise, and even if it did it would be occurring the entire time the vehicle was on. Not just when you turn on the air. Any reputable garage should check your belts for free. That would be my first step.

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