ANSWERS: 2
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What year is your Altima (do you have a serpentine belt)? Possible that if there's a manual adjustment for tightness to be made that it needs to be. When you turn on the A/C, does the noise go away, get louder, sound the same?
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It's probably one of your belts or your pullies, just hope it has nothing to do with your timing belt, the work required to replace those gets expensive...
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