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The idler pulley is near the top of the engine. Use a 15 MM (I think) socket on a long breaker bar, and turn the idler pulley arm so that the pulley moves away from the belt. You'll need to put the socket on the nut of the pulley, not on the arm itself. When the pulley is loose, you can pull the belt off. Some of the idler pulley arms have a square hole that accepts a 1/2 inch drive from a socket wrench breaker bar. But be careful. The serpentine belt routing is a little odd, and you'll want a picture to help you put it back. Make a drawing or take some pictures if you don't already have something from GM.
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How do you loosen a serpentine belt on a 1989 Chevrolet truck?
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