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What could cause the belt to jump off the pulley?

(1995 GMC 2500 Pickup)
in Westville, NJ on February 06, 2012
My belt keeps jumping off the pulley. I thought it was becuase of the air conditioner pulley so I got a new one. I also got a new belt. I dont know what else to do.
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Popular Answer
of Greg's Orange Auto on February 06, 2012
usually its your idler or tensioner pulley that causes this problem
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