Operational Check
INSPECTION AND ADJUSTMENT
Operational Check
STEP 1: Check Blower
1. Turn blower control dial clockwise, blower should operate on low speed.
2. Continue turning blower control dial clockwise, and continue checking blower speeds until all speeds are checked.
3. Leave blower on HI speed.
If NG, go to Diagnosis Procedure.
If OK, continue with next check.
STEP 2: Check Discharge Air
1. Press each mode switch and press DEF ( ) switch.
2. Each mode position indicator should illuminate.
3. Confirm that discharge air comes out according to the air distribution table. Refer to System Description.
NOTE:
Confirm that the compressor clutch is engaged (audio or visual inspection) and intake door is in the FRE
( ) position when the DEF ( ) is selected.
Intake door position is checked in the next step.
If NG, go to Mode Door Motor.
If OK, continue with next check.
STEP 3: Check Recirculation
1. Press REC ( ) switch.
Recirculation indicator should illuminate.
2. Press REC ( ) switch a second time.
3. Listen for intake door position change (you should hear blower sound change slightly).
If NG, go to Air Mix Door Motor.
If OK, continue with next check.
STEP 4: Check Temperature Decrease
1. Turn the temperature dial counterclockwise to 18�C (60F�).
2. Check for cold air at discharge air outlets.
If NG, go to Insufficient Cooling
If OK, continue with next check.
STEP 5: Check Temperature Increase
1. Turn the temperature dial clockwise to 32�C (90�F).
2. Check for hot air at discharge air outlets.
If NG, go to Insufficient Heating.
If OK, continue with next check.
STEP 6: Check AUTO Mode
1. Press the AUTO switch.
2. 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 Diagnosis Procedure.
If all operational checks are OK (symptom can not be duplicated), refer to Work Flow and perform tests as outlined to simulate driving conditions environment. If symptom appears, refer to Symptom Matrix Chart.