Part Type: A/C Selector Switch. A/C and Heater Selector Switch; Switch; Switches. A/C and Heater Selector Switch. 1986 GMC S15 w/ AC/Heater Selector; Alternate Number;. 1982 GMC S15 Engine: 1.9L L4;. 1987 GMC S15 w/ AC/Heater Selector; Alternate Number;.