1977 Cadillac Seville. 1978 Cadillac Seville. 1979 Cadillac Seville Engine: 5.7L V8;. Check Valve, Heater Valve. Vacuum Closes Non-Bypass Heater Valve. Heater Valve. Type: Heater Valves. Ensure that this part fits your vehicle by entering your vehicle's Year, Make, Model, Trim, and Engine in the Compatibility Table.
