1977 Cadillac Seville. 1979 Cadillac Seville Engine: 5.7L V8;. 1978 Cadillac Seville. Vacuum Closes Non-Bypass Heater Valve. Heater Valve. Manufacturer: Four Seasons. Type: Heater Valves. To confirm that this part fits your vehicle, enter your vehicle's Year, Make, Model, Trim and Engine in theCompatibility Table.
