Operational Check
TROUBLE DIAGNOSIS
Operational Check
The purpose of the operational check is to confirm that the system operates properly.
Conditions : Engine running at normal operating temperature
CHECKING 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 Maximum speed.
If NG, go to Blower Motor.
If OK, continue the check.
CHECKING DISCHARGE AIR
1. Turn mode door control dial to each position.
2. Confirm that discharge air comes out according to the air distribution table. Refer to Discharge Air Flow System Description.
Intake door position is checked in the next step.
If NG, go to Mode Door, Mode Door Motor.
If OK, continue the check.
CHECKING RECIRCULATION
If NG, go to Intake Door.
If OK, continue with the check.
CHECKING TEMPERATURE DECREASE
1. Turn temperature control dial counterclockwise to full cold position.
2. Check for cold air at discharge air outlets.
If NG, go to Insufficient Cooling.
If OK, continue the check.
CHECKING TEMPERATURE INCREASE
1. Turn temperature control dial clockwise to full hot position.
2. Check for hot air at discharge air outlets.
If NG, go to Insufficient Heating.
If OK, continue the check.
CHECKING A/C SWITCH (IF EQUIPPED)
1. Turn blower control dial to the desired position and push the air conditioner switch (if equipped) to turn ON the air conditioner.
2. Confirm that the A/C indicator lamp illuminates and that the compressor clutch engages (audio or visual inspection).
If NG, go to Power Supply And Ground Circuit, then if necessary, Magnet Clutch Circuit (If Equipped).
If all operational checks are OK (symptom can not be duplicated), go to How to Perform Efficient Diagnosis For an Electrical Incident and perform tests as outlined to simulate driving condition environment. If symptom appears, refer to Initial Inspection and Diagnostic Overview and perform applicable trouble diagnosis procedures.