Wher is the blower resistor pack on a 2005 gmc pickup

The blower motor resistor is located on the bottom of the heater case assembly on the passenger side. The blower motor is close to the kick panel on the passenger side as well. the two wires that come out of the blower motor go right to the resistor assembly. There is a chance that the resistor has burned the connector that plugs into it so you will need a resistor and a connector assembly if it is bad. Hope this helps

Underneath the dash near the passengers feet, right next to the blower motor. It is held by two screws or is clipped in with plastic clips. Probably screws though and has a wire harness attached to it. Very easy to replace, just might have to lay on your back on the passenger side floor to visually see it and remove the resistor pack.