I have a 2001 dakota that only has high speed on the heater blower motor. Any suggestions or location of the problem part would be greatly appreciated. Thank you.

The control switch on the dash must be messed up. If it only goes between off and high then it's likely to be the switch at fault. The blower motor will only get as much power as the switch will allow it to...

blower motor resistor in the air box, behind the glove box.
Alternatively, the switch could be bad, or also bad. but check the resistor first.