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Over time a belt can stretch to the point where the tensioner can no longer keep proper tension on it, or if it is an adjustable tensioner it may need tightening.

Also one of the pulleys or driven accessories may be failing and not able to keep up the same speed as the belt is turning so it makes noise.

Failing or dry bearings may be the culprit if the noise seems to be coming from the tensioner.

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15y ago
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Q: Why is Serpentine belt whining on 1996 buick regal?
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