1982 Dodge Omni Engine: 2.2L L4; Automatic Transmission; w/ AC;. 1988 Dodge Omni. 1989 Dodge Omni. 1990 Dodge Omni. Vacuum Closes 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.