Your Vehicle: 2009 Nissan-Datsun Altima V6-3.5L (VQ35DE)
 
Vehicle » Heating and Air Conditioning » Testing and Inspection » Component Tests and General Diagnostics » Air Mix Door » Manual Air Conditioner  
 
 
  Manual Air Conditioner  
 

AIR MIX DOOR MOTOR

Description

SYSTEM DESCRIPTION

Component Parts

Air mix door control system components are:

  • Front air control
  • Air mix door motor (LCU)

System Operation
The front air control receives user inputs through its various dials and switches. The front air control sends air mix door, mode door and intake door opening angle data to the air mix door motor LCU, mode door motor LCU and intake door motor LCU.
The air mix door motor, mode door motor and intake door motor read their respective signals according to the address signal. Opening angle indication signals received from the front air control and each of the motor position sensors are compared by the LCU's in each motor with the existing decision and opening angles. Subsequently, HOT/COLD or DEFROST/VENT or FRESH/RECIRCULATION operation is selected. The new selection data is returned to the front air control.

  

COMPONENT DESCRIPTION

Air Mix Door Motor .

  

The air mix door motor (1) is attached to the heater and cooling unit assembly. It rotates so that the air mix door is opened or closed to a position set by the front air control. Motor rotation is then conveyed through a shaft and the air mix door position feedback is then sent to the front air control by PBR built-in air mix door motor.

AIR MIX DOOR MOTOR

Diagnosis Procedure

SYMPTOM:

  • Discharge air temperature does not change.
  • Air mix door motor does not operate.

Inspection FLOW

  1. CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK - TEMPERATURE INCREASE
  1. Turn the temperature control dial clockwise to maximum heat.
  2. Check for hot air at discharge air outlets. >> GO TO 2
  1. CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK - TEMPERATURE DECREASE
  1. Turn the temperature control dial counterclockwise to maximum cold.
  2. Check for cold air at discharge air outlets. Can a symptom be duplicated?

YES >> GO TO 4
NO >> GO TO 3

  1. PERFORM COMPLETE OPERATIONAL CHECK Perform a complete operational check and check for any symptoms. Refer to See: Initial Inspection and Diagnostic Overview\Inspection And Adjustment\Operational Check\Manual Air Conditioner.

Is the Inspection result normal?
YES >> Refer to See: Symptom Related Diagnostic Procedures\Manual Air Conditioner\Symptom Matrix Chart.
NO >> System OK.

  1. CHECK FOR SERVICE BULLETINS Check for any service bulletins.

>> GO TO 5

  1. CHECK AIR MIX DOOR MOTOR OPERATION Check and verify air mix door mechanism for smooth operation.

Is the Inspection result normal?
YES >> GO TO 6
NO >> Repair as necessary.

  1. CHECK LAN SYSTEM CIRCUIT Perform diagnostic procedure for the LAN system. Refer to See: LAN System Circuit\Manual Air Conditioner.

Is the Inspection result normal?
YES >> GO TO 7
NO >> Repair as necessary.

  1. CHECK AIR MIX DOOR MOTOR PBR CIRCUIT Perform diagnostic procedure for the intake sensor circuit. Refer to "Diagnosis Procedure".

Is the Inspection result normal?
YES >> GO TO 8
NO >> Repair as necessary.

  1. RECHECK FOR SYMPTOMS Perform a complete operational check and check for any symptoms. Refer to See: Initial Inspection and Diagnostic Overview\Inspection And Adjustment\Operational Check\Manual Air Conditioner.

Does another symptom exist?
YES >> Repair as necessary.
NO >> Replace front air control. Refer to See: Control Module HVAC\Service and Repair.

DIAGNOSIS PROCEDURE FOR AIR MIX DOOR MOTOR
SYMPTOM: Discharge air temperature does not change.
Perform diagnosis procedure. Refer to See: LAN System Circuit\Manual Air Conditioner.