How to Replace Blower Motor Resistor 95-99 GMC Sierra K1500
Difficulty: Intermediate · About 30 min · Gmc Sierra K1500
Replace the blower motor resistor on a 1995–1999 GMC Sierra K1500 by lowering the glove box, transferring the resistor and relay wiring, and testing the blower speeds.
Tools you will need
- Socket Extensions
- 7mm Socket
- Ratchet
- Needle nose pliers
Parts and supplies
- Blower motor resistor
Steps
Lower the glove box
Switch off the ignition and empty the glove box. Press its rear corners inward to clear the stops, lower the box, and release it from its hinges to reach the HVAC components behind it.
Remove the old resistor
Remove the two 7 mm bracket screws and release the harness clips. Unplug the blower relay, unlock the resistor connector, then remove the resistor's two mounting screws and withdraw it from the housing.
Install the replacement resistor
Position the new resistor with its safety lock facing the passenger side and secure it with both screws. Reconnect the resistor plug and relay harness, then refit the bracket and secure the wiring connectors in their retainers.
Reinstall the glove box and test
Engage the glove-box hinges and press its side tabs back into place. Turn on the ignition and test the blower through its available speeds, confirming the connector and relay remain seated and the airflow changes as expected.
Check your vehicle’s repair manual for exact specifications and fit.