Part Type: HVAC Heater Core. 1978 Buick Estate Wagon Submodel: Wagon; Engine: 5.7L V8; w/ AC;. 1978 Buick Estate Wagon Submodel: Wagon; Engine: 6.6L V8; w/ AC;. Aluminum Heater Core. Heater Core. 1979 Buick Estate Wagon Submodel: Wagon; Engine: 6.6L V8; w/ AC;.
