Where is the crack you are talking about? If it is on the smooth side the belt needs to be replaced right away. If the cracks are on the grooved side it is pretty normal for the drive belts to get a few cracks in them as they age. I have NEVER seen one break! They should be replaced when there are a lot of cracks in the grooved side. If the belt fails the engine will run but you cannot drive the car, it will overheat.
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