Initial Inspection and Diagnostic Overview

Operational Check
The purpose of the operational check is to confirm that the system operates properly.

CONDITIONS:
- Engine running and at normal operating temperature.

PROCEDURE:




1. Check Blower
1. Turn fan control switch to 1-speed.
Blower should operate on 1-speed.
2. Then turn fan control switch to 2-speed, and continue checking blower speed until all speeds are checked.
3. Leave fan control switch on 4-speed.
If NG, go to, "Trouble Diagnosis Procedure for Blower Motor". Blower Motor
If OK, continue with next check.




2. Check Discharge Air
1. Turn knob to each mode.




2. Confirm that discharge air comes out according to the air distribution table.
Refer to, "Discharge Air Flow".
If NG, go to, "TROUBLE DIAGNOSIS PROCEDURE FOR MODE DOOR". Mode Door Motor
If OK, continue with next check.

NOTE: Confirm that the compressor clutch is engaged (visual inspection) and intake door position is at FRESH when the DEF mode is selected.
Confirm that the intake door position is at FRESH when the F/D mode is selected.
Intake door position is checked in the next step.




3. Check Recirculation
1. Press REC switch.
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". Intake Door Motor
If OK, continue with next check.

NOTE:
- Recirculation does not operate in DEF and F/D modes.




4. Check Temperature Decrease
1. Turn temperature control knob to full cold.
2. Check for cold air at discharge air outlets.
If NG, go to "Trouble Diagnosis Procedure for Insufficient Cooling". Insufficient Cooling (Performance Test)
If OK, continue with 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, go to "Trouble Diagnosis Procedure for Insufficient Heating". Insufficient Heating




6. Check Air Conditioner Switch
Turn the fan control switch to the desired (1-to 4-speed) position and push the A/C switch to turn ON the air conditioner.
The indicator lamp should come on when air conditioner is ON.
If NG, go to "Trouble Diagnosis Procedure for Magnet Clutch". Magnet Clutch