How to Replace the Blower Motor Resistor in a 2005 Yukon

In 1992, GMC dropped its full-sizedJimmy and replace it with the Yukon. Two years later, Chevy would follow the same suit, replacing its full-size Blazer with the Tahoe. The 2005 GMC Yukon came standard with a 285-horsepower, 4.8-liter V-8 engine and air conditioning. The blower motor resistor regulates voltage to the blower motor, thereby regulating the speed of the blower motors fan. When the blower motor resistor fails, the fan may work on only a few speeds, typically just the highest, or not work at all. Replacing the 2005 Yukons blower motor resistor is a straightforward task that most DIYers can complete.

Instructions

1

Adjust the passengers side seat as far back as it will go. Look under the dashboard and find the under-dash sound insulator, which is a black panel covering the heating and air-conditioning box. Remove the four bolts securing the panel, using a ratchet and socket, and remove the panel.

2

Press and hold the unlocking button on the wiring harness plugged into the blower motor and unplug the harness.

3

Find the blower motor resistor to the side of the blower motor. Press and hold the unlocking button on the resistors wiring harness and unplug the harness.

4

Remove the two blower motor resistor screws with a ratchet and socket and pull the resistor from the heating and air-conditioning box.

5

Slide the new blower motor resistor into the heating and air-conditioning box and hand-thread its retaining screws. Tighten the retaining screws to 14 inch-pounds with an inch-pound torque wrench and socket.

6

Plug the wiring harness into its receptacle on the blower motor, then plug the wiring harness into the blower motor resistor.

7

Reinstall the under-dash sound insulator, if equipped, and hand-thread its four retaining bolts. Tighten to 14 inch-pounds.