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Most serpentine belt issues are caused by pulley mis-alignments. The tensioner wears and can become mis-aligned and cause excessive stress and heat on the belt. The Idler and Tens. pulleys are the weakest links in the series of pulleys guiding this belt.
These will wear out first and may have been a factor in last years episode with the belt.
If you are replacing these (especially these two, Idler &/or Tens.) inspect both at the same time. They are replaced with equal skill. Also I highly recommend going with OE parts. Aftermarket is ok for the most part but if you are doing these services yourself you'll have limited warranty room and it's just best to go with what will work in the long term.
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