This machined-face upgrade control panel is internally lighted and delivers infinite louver air temperature regulation and bi-level operation of A/C and heat.With simple plug-in connections no vacuum lines and fewer wires to route the panel operates our exclusive servo-actuated heater valve which allows the introduction of small amounts of heat to regulate air temperature.Dimensions are 2.5-inches wide x 4.69-inches tall x 2.625-inches deep.