Where is the fuse for the blower motor located on a 1997 Ford E-250 Van?

there is no fuse its either the relay on the side wall in the drivers side front fender thats bad or its the hi low fan control dial in the dash or it can be what is called the blower motor resistor wich is just to the right of the blower motor itself the resistor controls the speed of the fan i think aswell so if its blowing but only a lil its probally the resistor.