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Welcome to the forum.

Sounds to me like your serpentine belt was fraying before ultimate failure. Check the bearings in your idler and tensioner pulleys. One may have frozen to cause this problem. It may also be bearings going out in the driven components...alternator, water pump, AC unit?, etc. In view of the damage caused, I would replace the idler/tensioner pulley bearings before installing a new belt as a preventative measure.
 

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Serpentine belts are extremely strong. I suppose that when the serpentine belt starts to shred, it is tougher than a weedwhacker, if you don't catch it right away. You must inspect the belt for wear as part of your routine checks. I would put metal sheathing around the radiator hose and wiring harness to prevent this from happening again.
 
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