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Serpentines can last up to ten years an an average car. When looking at the belt on the ribbed side, you need to replace it when there are two sections of ribbing missing within two inches from each other. If there is a small(1/2) piece missing from 1 rib, the belt is fine.
This is the belt on your car that drives the accessories. In order to technically be a serpentine belt, it must drive multiple accessories. Things like: 1  Power steering pump. 2  Alternator. 3  Air conditioning compressor. 4  Water pump. 5  Super charger. 6  Smog pump(this is an emissions control on older cars.o you need a properly functioning belt, YES. Do you have to replace it right now, probably not. This is a part that I highly recommend you ask your mechanic to show you. If it looks like it is full of cracks, or is soaked in oil/coolant, replace it.