A/c pwr steering drive belt keeps coming off - Eclipse Mitsubishi Cars & Trucks

If you have set the tension correcly when replacing the belt there are a couple of things that could be going on. #1 it is possible that the belt itself is the wrong length or width. Be sure that the belt you have is a good replacement for your make and model. Also I have repaired a vehicle that had this problem and it was because of the tension roller was freezing up and not moving the belt along properly so replacing that roller fixed the problem. Also, if the angle of one of the aspects of what the belt goes over is slightly cockeyed it can cause the belt to come off as well. I would suspect the length or width of that belt is your problem. Make sure that you have the correct belt, set the tension properly, check all the angles of the devices it rolls over and make sure nothing is slow, bound or not moving(frozen up) and this problem should be fixed. Good Luck