mode. PartQualifier: mode. Servo. An Actuator used to control the HVAC air inlet Door. An Actuator used to control the HVAC defrost mode Door. An Actuator used to control the HVAC floor mode Door. Part included in evaporator assembly. Switches modes for the blend Doors. Air Inlet. Blend. Defrost Mode. Floor Mode. Mix. SUB - ASSEMBLY, DamP. Temperature. Included with: Evaporator assembly.