I am changing a serpentine belt on a 1999 plymouth grand voyager. I would like to know what tools (specific sizes) do I need to bring to the car the car is on the side of the road. It is a 1999 Plymouth Grand Voyager 3.3 liter.

You likely need a 15mm socket and a 15-inch breaker bar. In a pinch, a large ratchet wrench or long 15mm box-end wrench may work. If the tensioner pulley has more than 80,000 miles on it, this is the ideal time to replace it.