Serpentine belt riding up on the rear of the air cond. pulley. After checking various post yesterday, took a good look at the tensioneer. Belt appeared to be comoing off the tensioneer at an angle, forcing the above condition. Cross referenced the Goodyear # 49505 at NAPA. Part # is 38157. New tensioneer has steel pulley and half inch hole for breaker bar. Original Dayco pulley was worn to a convex shape. 51,000 mi. THANKS FOR YOUR POST. Great help - Should be good to go.