How to Replace Blower Motor Resistor 03-06 GMC Sierra 2500 HD
Difficulty: Intermediate · About 35 min · Gmc Sierra
Replace the blower motor resistor on a 2003–2006 GMC Sierra 2500 HD by removing the lower dash cover, unplugging the harnesses, and testing the fan settings.
Tools you will need
- 7mm socket and ratchet
- 7/32-inch socket
Parts and supplies
- Blower motor resistor
Steps
- Remove the lower dash panel
Remove the four fasteners beneath the glove compartment and lower the panel to reach the resistor. Support the cover as the final bolt comes free.
- Disconnect and remove the resistor
Unplug the resistor harness and remove the cover fasteners that block access to the remaining connector. Disconnect that harness, then unbolt and remove the resistor.
- Install the new resistor
Mount the replacement resistor and tighten its fasteners to the vehicle's specification. Reconnect both harnesses, reinstall any obstructing cover, and check that each plug is locked.
- Reassemble and test
Refit the under-dash panel and its four fasteners. Run the blower at several speeds and confirm the resistor operates normally before completing the repair.
Check your vehicle’s repair manual for exact specifications and fit.