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This is a serpentine belt for a 2004 BMW 330i air conditioner pulley. The old belt was in okay condition, but since I was changing the big serpentine, I figure I should change the a/c belt.
It's an easy job. Pop the cap off the center of the tensioner, then use a T50 bit to move the tensioner pulley, so the belt can be installed. The tensioner needs to be turned clockwise to loosen the tension. Slide the belt on and release the tensioner. Pop the cap back on and you're set.
Works like a charm!