The problem started when the alternator was replaced. The serpentine belt was replaced at that time and all the other parts in the pulley area are new as far as I know. It just so happen that about a week later a hurricane came over Atlanta. I was driving up a hill in a blinding rain storm in a not so nice part of the city when the belt failed. The power steering became very hard and the car started overheating. I got off the road just in time.
My mechanic replaced the serpentine belt for free because he thought the belt had failed because rocks form a big splash of water had caused the problem.
About 2 weeks later, I hit a small puddle of water and the belt failed again. This time my mechanic went over car carefully again. I suggested that it might be the water pump. There was a small amount of play in the water pump, but it was not leaking. We thought we had the problem solved.
We had 5 weeks with no rain. During this time the car functioned fine.
This week we had a 2 day rain storm on Monday and Tuesday. The car ran fine.
This Friday I was coming home from work in a light rain storm. I was almost home when you guessed it the serpentine belt failed again. I pulled off at the Yellow River Game Ranch. I stood on the porch of the ranch me and 3 peacocks waiting for another tow tuck.
I have a very good mechanic who has been in business a long time. We are running out of alternatives.
What else can I tell you?
The belt broke 3 times.
Water seems to be the common element.
The car is a 1999 Dodge Caravan with 200,000 plus files. The transmission was replaced 1 year ago. It has the midsize 6 cylinder engine. I think it is a 4.2.