Whoa... Something ain't right. Either the belt is not properly routed (possible, but not likely), or your tensioner pointer is not properly positioned. Here's what to do. Loosen the big retainer bolt in the center of the tensioner (19mm). Back off the tensioner adjusting bolt (the long one behind the PS pump) Take a look at the little pointer and press down on it and set it to the edge of the big end of the triange on the tensioner. Recheck the belt routing and make sure that's OK. Start cranking down on the tensioner bolt until the pointer moves the to far end of the triangle (the little end). Retorque the big retainer bolt and you should be OK. The pointer is easily moved and I suspect your pointer is not properly positioned. If it can't be adjusted properly this way, then something else is amiss. Good Luck and Merry Christmas...BTW, there are two versions of the tensioner. one with markings and one without. Your version has the triangle (without). Same rule applies for both..
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..
"Warranty" is just another way of postponing the inevitable.