Operational Check: Procedure:

WARNING: This page is about a different car, the 2003 Infiniti I35. However, it is still accessible from the selected car via links, so may be relevant.

Check Memory Function
1. Set the temperature 90°F or 32°C.
2. Press OFF switch.
3. Turn the ignition off.
4. Turn the ignition on.
5. Press the AUTO switch.
  
  Fig 1: Pressing AUTO Switch
  Courtesy of NISSAN MOTOR CO., U.S.A.
6. Confirm that the set temperature remains at previous temperature.
7. Press OFF switch.
If NG, go to trouble diagnosis procedure for, MEMORY FUNCTION .

If OK, continue with next check.
Check Blower
1. Press fan switch (up side) one time. Blower should operate on low speed. The fan symbol should have one blade lit.
2. Press fan switch (up side) one more time, and continue checking blower speed and fan symbol until all speeds are checked.
  
  Fig 2: Pressing Fan Switch
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Leave blower on MAX speed.
If NG, go to trouble diagnosis procedure for, BLOWER MOTOR .

If OK, continue with next check.
Check Discharge Air
1. Press mode switch four times and DEF button.
  
  Fig 3: Pressing Mode Switch
  Courtesy of NISSAN MOTOR CO., U.S.A.
2. Each position indicator should change shape.
3. Confirm that discharge air comes out according to the air distribution table below.
  
  Fig 4: Identifying Discharge Air Flow Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Refer to Discharge Air Flow .
NOTE: Confirm that the compressor clutch is engaged (visual inspection) and intake door position is at FRESH when the DEF is selected.

Intake door position is checked in the next step.

If NG, go to trouble diagnosis procedure for, MODE DOOR MOTOR .

If OK, continue with next check.
Check Recirculation
1. Press REC switch.
  
  Fig 5: Pressing REC Switch
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Recirculation indicator should illuminate.
2. Listen for intake door position change (you should hear blower sound change slightly).
If NG, go to trouble diagnosis procedure for, INTAKE DOOR .

If OK, continue with next check.
Check Temperature Decrease
1. Turn the temperature dial counterclockwise until 18°C (60°F) is displayed.
  
  Fig 6: Checking Temperature Increase
  Courtesy of NISSAN MOTOR CO., U.S.A.
2. Check for cold air at discharge air outlets.
If NG, go to trouble diagnosis procedure for, INSUFFICIENT COOLING .

If OK, continue with next check.
Check Temperature Increase
1. Turn the temperature dial clockwise until 32°C (90°F) is displayed.
  
  Fig 7: Turning Temperature Control Knob
  Courtesy of NISSAN MOTOR CO., U.S.A.
2. Check for hot air at discharge air outlets.
If NG, go to trouble diagnosis procedure for, INSUFFICIENT HEATING .

If OK, continue with next check.
Check ECON (Economy) Mode
1. Set the temperature 75°F or 25°C.
2. Press ECON switch.
  
  Fig 8: Pressing ECON Switch
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Display should indicate ECON (no AUTO).
Confirm that the compressor clutch is not engaged (visual inspection).

(Discharge air and blower speed will depend on ambient, in vehicle and set temperatures.)

If NG, go to trouble diagnosis procedure for, ECON (ECONOMY) MODE .

If OK, continue with next check.
Check AUTO Mode
1. Press AUTO switch.
  
  Fig 9: Pressing Auto Switch
  Courtesy of NISSAN MOTOR CO., U.S.A.
2. Display should indicate AUTO (no ECON).
Confirm that the compressor clutch engages (audio or visual inspection).

(Discharge air and blower speed will depend on ambient, in vehicle and set temperatures.)

If NG, go to trouble diagnosis procedure for, A/C SYSTEM , then if necessary, trouble diagnosis procedure for, MAGNET CLUTCH .

If OK, continue with next check.