Operational Check

Operational Check
The purpose of the operational check is to confirm that the system operates as it should. The systems which are checked are the front blower, mode (discharge air), intake air, temperature decrease, temperature increase, compressor, and rear blower.

CONDITIONS:
Engine running at normal operating temperature

PROCEDURE:




1. Check Front Blower
1. Turn mode control knob to any mode position except OFF.
2. Turn fan control knob to 1-speed.
Blower should operate on 1-speed.
3. Turn fan control knob to 2-speed.
4. Continue checking blower speed until all four speeds are checked.
5. Leave blower on 4-speed.
If NG, refer to "Front Blower Motor".
If OK, continue with the next check.

2. Check Discharge Air




1. Turn mode control knob.




2. Confirm that discharge air comes out according to the air distribution table.
Refer to "Discharge Air Flow".
If NG, refer to "Mode Door Motor".
If OK, continue with the next check.




3. Check MAX A/C (Recirculation)
1. Turn mode control knob to MAX A/C (recirculation).
2. Listen for intake door position change (you should hear blower sound change slightly).

NOTE: MAX A/C (recirculation) does not operate in DEF and F/D modes.

If NG, refer to "Intake Door Motor".
If OK, continue with the next check.




4. Check Temperature Decrease
1. Turn temperature control knob to full cold.
2. Check for cold air at discharge air outlets.
If NG, refer to "Insufficient Cooling".
If OK, continue with the next check.




5. Check Temperature Increase
1. Turn temperature control knob to full hot.
2. Check for hot air at discharge air outlets.
If NG, refer to "Insufficient Heating".
If OK, continue with the next check.




6. Check A/C Switch
1. Turn mode control knob to any mode position except OFF
2. Turn fan control knob to the desired (1 to 4-speed) position.
3. Push the A/C switch to turn ON the air conditioner.
The indicator light should come on when air conditioner is ON.
4. Confirm that the compressor clutch engages (audio or visual inspection).
5. Check for cold air at the appropriate discharge air outlets.
If NG, refer to "A/C System".
If OK, continue with the next check.

7. Check Rear Blower




1. Set rear fan switch (front) to REAR position.
2. Press any mode switch except OFF
3. Press A/C switch ON.
4. Turn rear fan switch to 1-speed.
Blower should operate on 1-speed.
5. Confirm air flow from the rear discharge outlets.
6. Turn rear fan switch to 2-speed.
7. Continue checking blower speed until all four speeds are checked.




8. Turn rear fan switch (rear) to 0-speed (OFF).
9. Set rear fan switch (front) to 1-speed.
Blower should operate on 1-speed.
10. Set rear fan switch (front) to 2-speed.
11. Continue checking blower speed until all four speeds are checked.
If NG, refer to "Rear Blower Motor". If all operational checks are OK (symptom cannot be duplicated), refer to "Incident Simulation Tests" and perform tests as outlined to simulate driving conditions environment. If symptom appears, refer to "Symptom Chart" and perform applicable trouble diagnosis procedure.