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

INTAKE DOOR MOTOR

Description

SYSTEM DESCRIPTION

Component Parts

Intake door control system components are:

  • Front air control
  • Intake door motor (LCU)

System Operation
The intake door control determines the intake door position based on the position of the recirculation switch.
When the recirculation switch is depressed the intake door motor rotates closing off the fresh air inlet and recirculating the cabin air. If the recirculation switch is depressed again, the intake door motor rotates in the opposite direction, again allowing fresh air into the cabin.

  

COMPONENT DESCRIPTION

Intake Door Motor

  

The intake door motor (1) is attached to the blower unit. It rotates so that air is drawn from inlets set by the front air control. Motor rotation is conveyed to a lever which activates the intake door.

INTAKE DOOR MOTOR

Diagnosis Procedure

SYMPTOM:

  • Intake door does not change.
  • Intake door motor does not operate normally.

Inspection FLOW

  

  1. CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK - REC ( )
  1. Press the vent mode.( ).
  2. Press REC ( ) switch. The REC ( ) indicator should illumination.
  3. Press REC ( ) switch again. The REC ( ) indicator should go out.
  4. Listen for intake door position change (you should sound change slightly). Can a symptom be duplicated?

YES >> GO TO 3
NO >> GO TO 2

  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 4

  1. CHECK INTAKE DOOR MOTOR OPERATION Check and verify intake door mechanism for smooth operation.

Is the Inspection result normal?
YES >> GO TO 5
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 6
NO >> Repair as necessary.

  1. CHECK AIR MIX DOOR MOTORS PBR CIRCUIT Perform diagnostic procedure for the air mix door motor. Refer to See: Air Mix Door\Manual Air Conditioner.

Is the Inspection result normal?
YES >> GO TO 7
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 INTAKE DOOR MOTOR
SYMPTOM: Intake door motor does not operate normally.
Perform diagnosis procedure. Refer to See: LAN System Circuit\Manual Air Conditioner.