Serpentine belt, tensioner: problems, signs of wear, when to replace, noises

What are the signs of a bad serpentine belt? What happens if a serpentine belt breaks? What are the common problems that can cause a serpentine belt to squeal, come off or shred? When should the belt be replaced?

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Serpentine belt, tensioner: problems, signs of wear, when to replace, noises

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What could be causing this uneven wear on my idler pulley (Replaced belt, tensioner assembly, idler pulley, and crank pulley March 2020) : r/MechanicAdvice

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