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Some cracks in a serpentine belt are normal. If the crack run the entire width of the belt then it should be replaced. Also if there are any sections of the ribs missing it should be replaced. Replacing the serpentine belt is easy on most cars and can be done with common tools.
If you leave a worn belt, it can break, and immediately some lights will appear on your dash, such as the battery/alternator light. You will lose Power Steering, and your water pump will not work. If you have AC, that will not work either. If you see the battery light come on look in the rear view mirror for the belt.
If it does break, pull over and turn the car off.
Belts are cheap, might as well replace it.
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