Part Type: HVAC Heater Core. 2007 Chevrolet Silverado 1500 Classic Submodel: Crew Cab Pickup; Engine: 4.3L V6; Except RPO Code D07; w/o Custom Front Floor Console;. 2007 Chevrolet Silverado 1500 Classic Submodel: Crew Cab Pickup; Engine: 4.8L V8; Except RPO Code D07; w/o Custom Front Floor Console;.