Goodyear make a replacement belt system where the belt has grooves and the pulley has groove and the has work for me. i have a 97 and was experiencing the same problem. i got it from car quest auto. it a sure fix
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Make sure the plastic shield is not missing below the pulleys which keeps road debris and excess water off belt and pulleys. Also check that the alternator or power steering pump are not slightly out of alignment.
First of all your belt shouldn't be coming off at all period, it sounds like either you have the wrong size belt on your vehicle, or your Idler/ Belt Tensioner is going bad and not keeping your belt tight on the pulleys. I would first check to see if you have the right size belt for your vehicle and check to see if your Belt Tensioner is working properly and not frozen or seized.
Replacing the belt tensioner and the serpentine belt will fix that for good. A temporary fix will be to remove the belt and wash it with regular soap and water inside and out (also wipe clean the pulleys), let it dry and apply Belt Dressing to the inside of the belt, and reinstall it. This will give the belt more traction and hopefully keep it in place.
I think your belt is worn and the belt tensioner lost some of it's tension, but, if you don't want to spend $$, try the above fix, it may work for you.
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dodge and ply. all had this problem tensioner will tilt out under load and belt comes off happens more so when raining they make a kit to repair updated tensioner with a lip on pulley and grooves and a belt with ribs on both sides to keep it in line it is expensive i have replaced belt and tensioner but weld a ring around pulley as a guide to keep it from coming off or find a smooth pulley thats the same size with a lip on it
umm.. belts dont just come off when they are wet. who put this one on origionally? make sure the belt is the right length for the car - check that the pattern matches for the placement of the belt with the diagram on the front of the car under the hood and make sure it is tightened up so the deflection on the longest part is between 1" and 3/4". if the belt was tight then you may have a problem with your harmonic balancer which is the part on the motor than spins the belt - if that is bent or got broken then if would have a hard time keeping belt on but that shouldnt have anything to do with getting wet.
I have had the same trouble with my 2002 zx2. I have had to reinstall or replace the serpentine belt 4 or 5 times in less than a year. I have replaced the idler bearing and then the water pump went out which took out the belt as well. The belt still came off after replacing those items when I hit another puddle of water. I found that proper installation of the plastic engine splash guards which bolt to the bottom around the motor play an important roll in keeping out road water. Since the pulleys are accessible with the right front tire removed, I focused on securing the plastics tightly around the wheelwell framework. This has helped extremely in keeping water away from the pulleys. I haven't had any more troubles in the last 7 or 8 months. I'm still leary when driving in the rain as the routing of the serpentine belt on this car is the worst I've ever encountered.
Bottom line, check/replace idler bearing, tensioner if needed and make sure all plastic splash guards are there and properly screwed to the frame and each other.
Hope this helps.