The HVAC Blower Fan Switch controls various fan speeds of the vehicles AC/heater system. When not replaced, the AC or heater will not run properly or only operate at certain fan speeds. Dorman's HVAC Blower Fan Switch is constructed of high-quality polymers and copper alloys for superior conductivity and long-lasting durability. The HVAC Fan Switch has been improved as a direct replacement for an easy and complete installation. All Dorman products are engineered in the United States and backed by 100 years of automotive aftermarket experience. Our solutions are thoroughly tested and inspected, and if you experience any difficulty installing or using our parts, we have a dedicated technical support team of ASE Blue Seal certified professionals ready to help. To learn more about our quality and innovation, visit DormanProducts.com.