Serpentine Belt Keeps coming off. I am puzzled. ??
Ok, doesnt make sense. The past 3 days, I drive my truck for about a half hour, everying is good, gagues, temps, drivability, etc. I get to my destination, turn off the truck and then I come back a couple hours later. I then turn on the truck, and its squealing, i lift the hood, and the belt came off the power steering pulley, its just sitting off to the side. its done this 3 times in the past 3 days. So of corse, I thought it was the tensioner. I went and bought a new setup, put it on, everything seemed great, until it did it again, TWICE. so im thinking belt, well the belt is in MINT condition. pretty much brand new. and yes, its the right belt. What in the world is causing the belt to slip off after I turn off the truck after driving for awhile? The belt does not come off right away either, because I have my friend turn off the truck while im watching the belt, and it turns off fine, and the tensioner does its job. The belt is tight and everything, then I come back 2 hours later and its off. This doesnt make sense. The belt is very tight, and the tensioner is working, you can see it while its running. but for some reason it keeps coming off. Im wondering if the belt is stretching because of the constant 105 degree weather, but still, the belt is in mint shape. Please reply and let me know what you think it is, it doesnt make sense, and it just started a couple days ago. Thanx guys. please keep the replies coming, I need them, I dont want to get stranded.