Part Type: HVAC Heater Core. 2007 GMC Sierra 1500 Classic Submodel: Crew Cab Pickup; Engine: 4.3L V6; w/ Rear Vents In Center Console;. Aluminum Heater Core. Heater Core. 2007 GMC Sierra 1500 Classic Submodel: Crew Cab Pickup; Engine: 4.8L V8; w/ Rear Vents In Center Console;.
