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Check the serpentine belt for cracking and "checking" by a close visual examination. Look at the "inside" of the belt where it rides on the pulleys. The grooves should not be cracked, or missing ridges on the inside of the belt. Also, check the idler/tensioner pulley bearing for noise/wear. I changed mine when I replaced the spur ( timing ) drive belt and tensioner/idler pulley/shock absorber at 100,000mi. I also replaced the AC compressor drive belt and idler/tensioner pulley at that time.

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