1971 Chevrolet Chevelle. 1973 Chevrolet Chevelle Threaded;. 1972 Chevrolet Chevelle. 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.
