5132. Door actuator. FRONT. W/O AUTO TEMP CONTROL. An Actuator used to control the HVAC air inlet Door. An Actuator used to control the HVAC defrost mode Door. Switches modes for the blend Doors. Air Inlet. Assembly - MODE Valve. Blend. Defrost Mode. Mix. Temperature. Motor. Included with: AC & heater case, Air distributor, Air inlet.