Description & Conditions

DESCRIPTION

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

CONDITIONS: • Engine running and at normal operation temperature.

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 HAC-127, "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 HAC-107, "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 HAC-124, "Diagnosis Procedure".

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 toHAC-124, "Diagnosis Procedure".

If OK, continue with next check.

STEP 4: Check Temperature Decrease

1. Turn the temperature dial counterclockwise to maximum cold.

2. Check for cold air at discharge air outlets.

If NG, go to HAC-122, "Diagnosis Procedure".

If OK, continue with next check.

STEP 5: Check Temperature Increase

1. Turn the temperature dial clockwise to maximum heat.

2. Check for hot air at discharge air outlets.

If NG, go toHAC-122, "Diagnosis Procedure".

If OK, continue with next check.

STEP 6: Check Air Conditioner Switch (if equipped)

1. Turn blower control dial to the desired position and push the A/C switch to turn ON the air conditioner

2. Confirm that the A/C indicator illuminates and that the compressor clutch engages (audio or visual inspection).

If NG, go to HAC-135, "Diagnosis Procedure", then if necessary, HAC-131, "Diagnosis Procedure".

If OK, listen to customer complaint (get detailed information about the conditions and environment when the symptom occurs). Verify the symptom and refer to HAC-155, "Symptom Matrix Chart".