631 Blower Motor Resistor for GM w/ auto air and rear vents.
Works/fits perfect! Looks to be much better built than than the OEM resistor in my 2006 GMC Sierra 2500HD Duramax that failed. Pretty easy install, even without instructions. Comes with all the crimp connectors/screws you need/color coded wires; however I used a smaller crimp connector for the smaller wire. Would recommend this item to anyone!