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A serpentine belt almost never breaks unless one thing happens---one of the accessories seizes and won't turn.Remove the belt and see which pulley won't turn.The serpentine belt is strong enough to keep the engine from cranking up(better grip on the pulleys compared to the old V-belts).I actually remember a tech 3 stalls down from me sell a customer an engine,only to find the alternator was just seized.(embarassing!)Any one accessory bearing will keep it from cranking up,and I'm sure you'll find it quickly after removing the belt.
Mine was doing the same thing. I realized that one of the support brackets for the power steering pump was brocken allowing the pump to pull slightly away from the engine moving the belt out enough to be cut by the other pullies. I hope this helps! Good luck!
Chevy made at least five different engines for pickups in 1989, and with a lot of accessory options. Check this link and select your pickup and engine size. When you get the listing of belts, if you see a small camera icon in the left column, click on it and you will see the diagram of the routing.
check your frame for the diagram or go to google images look up 1997 Chevy Cheyenne C2500 w/5.7L V8 serpentine belt diagram they will have it might not be the first pic
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