Firstly, I'm from the UK and my 85K5 is my first American truck.!!! I have a broken belt, but, what belt is it. If you stand at the radiator grille looking at the engine, it's the belt on the left, from the fan to (This is what I don't know) It comes from the fan to a pump or something on the left (As you look at the motor) This pump? can be adjusted to I guess adjust tension or something? I had to drive home with no belt on this, What is this unit? did I harm my motor by driving it?