Operational Check (Front)
INSPECTION AND ADJUSTMENT
Operational Check (Front)
The purpose of the operational check is to confirm that the system operates properly.
Conditions : Engine running and at normal operating temperature
CHECKING MEMORY FUNCTION
1. Set the temperature to 32� (90�F).
2. Press the OFF switch.
3. Turn ignition switch OFF.
4. Turn ignition switch ON.
5. Press the AUTO switch.
6. Confirm that the set temperature remains at previous temperature.
7. Press the OFF switch.
If NG, go to trouble diagnosis procedure for Memory Function Does Not Operate.
If OK, continue with next check.
CHECKING BLOWER
1. Press the blower speed control switch (+) once, blower should operate on low speed. The fan display should have one bar lit (on display).
2. Press the blower speed control switch (+) again, and continue checking blower speed and fan display until all speeds are checked.
3. Leave blower on maximum speed.
If NG, go to trouble diagnosis procedure for Diagnosis Procedure.
If OK, continue with next check.
CHECKING DISCHARGE AIR
1. Press MODE switch four times and the DEF switch.
2. Each position indicator should change shape (on display).
3. Confirm that discharge air comes out according to the air distribution table. Refer to Discharge Air Flow (Front).
Mode door position is checked in the next step.
If NG, go to trouble diagnosis procedure for Mode Door Motor (Front) Diagnosis Procedure.
If OK, continue the check.
NOTE:
Confirm that the compressor clutch is engaged (sound or visual inspection) and intake door position is at fresh when the DEF or D/F is selected.
CHECKING RECIRCULATION (
,
ONLY)
1. Press recirculation ( ) switch one time. Recirculation indicator should illuminate.
2. Press recirculation ( ) switch one more time. Recirculation indicator should go off.
3. Listen for intake door position change (blower sound should change slightly).
If NG, go to trouble diagnosis procedure for Diagnosis Procedure.
If OK, continue the check.
NOTE:
Confirm that the compressor clutch is engaged (sound or visual inspection) and intake door position is at fresh when the DEF or D/F is selected. REC ( ) is not allowed in DEF ( ) D/F ( ) or FOOT ( ).
CHECKING TEMPERATURE DECREASE
1. Rotate temperature control dial (drive or passenger) counterclockwise until 18�C (60�F) is displayed.
2. Check for cold air at appropriate discharge air outlets.
If NG, listen for sound of air mix door motor operation. If OK, go to trouble diagnosis procedure for Component Function Check. If air mix door motor appears to be malfunctioning, go to .
If OK, continue the check.
CHECKING TEMPERATURE INCREASE
1. Rotate temperature control dial clockwise (drive or passenger) until 32�C (90�F) is displayed.
2. Check for hot air at appropriate discharge air outlets.
If NG, listen for sound of air mix door motor operation. If OK, go to trouble diagnosis procedure for Insufficient Heating. If air mix door motor appears to be malfunctioning, go to .
If OK, continue with next check.
CHECK A/C SWITCH
1. Press A/C switch when AUTO switch is ON, or in manual mode.
2. A/C switch indicator will turn ON.
- Confirm that the compressor clutch engages (sound or visual inspection).
NOTE:
If current mode setting is DEF or D/F, compressor clutch will already be engaged and cannot be turned off.
If NG, go to trouble diagnosis procedure for Diagnosis Procedure.
If OK, continue with next check.
CHECKING AUTO MODE
1. Press AUTO switch.
2. Display should indicate AUTO.
- If ambient temperature is warm, and selected temperature is cool, confirm that the compressor clutch engages (sound 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 Auto AMP Power and Ground Diagnosis Procedure, then if necessary, trouble diagnosis procedure for Diagnosis Procedure.
If all operational checks are OK (symptom cannot be duplicated), go to malfunction Simulation Tests in How to Perform Trouble Diagnosis For Quick and Accurate Repair and perform tests as outlined to simulate driving conditions environment. If symptom appears. Refer to Diagnosis Chart By Symptom, and perform applicable trouble diagnosis procedures.