On the 2001 Durango (with rear AC) the resistor pack is inside the vehicle, on the passenger side. If you are sitting in the passenger seat, your toes are pointing at it. There is a 5 wire harness hanging straight down plugged into it, and it is screwed into the ductwork using 2 8mm screws. It helps to remove the screw holding the duct that restricts access to the front screw holding the resistor and the duct forward as far as possible.
Once the old resistor is out, pull the red lock tab from the connector to remove it.
Install is opposite procedure.
For more information visit: http://www.gtrippleb.com/auto/durango/durango_blower_resister.htm
Your truck has both. the resistor is between the switch & blower.thje resistor controls the blower speed
With great difficulty!
The resistor is under the passenger dash just left of the blower motor
You need to replace blower motor resistor.
The blower motor speed resistor is burned out.
No such part exists
Somewhere in the path of the air that the rear blower motor blows
That's too bad
replace the blower motor resistor
Failed blower motor, resistor or switch.
Under the dash, on the passenger side.
Behind the glove box