Belts are turned by the crankshaft. The serpentine belt starts at the crank and spins the alternator, the power steering pump, the water pump, and the clutch fan (if you don’t have e fans). The other belt is spun from the crankshaft and spins the AC compressor.
Installing the belts seems hard, but it really isn’t. You just have to know the sequence of the belts. Remember that you need to look at the RPO codes on the inside of your glove box to see what alternator you have which will determine which serpentine belt you need.
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