Removed from a 1984 Chevy Truck HEATER & A/C Wiring Harness. This harness is both under dash and engine compartment wiring harness for climate control. View pics and check application before bidding. Fits GMC Chevy Square body’s. 1981 1982 1983 1984 1987 1990 91 Blazer Suburban K5 C10 C20 4x4.