OER Parts offers a wide selection of Heater Parts for your 1980 Buick Century. OER Parts offers 1980 Buick Century Expansion Valve, 1980 Buick Century Hose Clamps, 1980 Buick Century Hose Fittings, 1980 Buick Century Hoses and Lines, 1980 Buick Century Vent and Duct Parts.