1. Belt tensioner spring is weak. If so, tensioner must be replaced.
2. Wrong size belt, or belt not routed correctly -- double-check the diagram that should be in the engine compartment.
3. Sticking or binding accessory (power steering pump, water pump, alternator, A/C compressor, idler pulley, etc.). With the belt off, you should be able to turn all of those pulleys by hand without much resistance and you should not feel any play if you try to wobble them side-to-side.
Monday, March 1st, 2010 AT 2:18 AM