As the title says, it blows at one speed regardless of where the speed switch is.

Any ideas?

 

Most blowers work by getting full voltage for the "HI" speed. The switch resistors the voltage down for lower speeds. I'm not yet familiar enough with these Dodges to know where the resisters are but that should be your problem. Usually either in the switch or a resistor pack on the side of the heater box.

Derek