Operational Check

The purpose of the operational check is to confirm that the system is as it should be. The systems which will be checked are the blower, mode (discharge air., intake air, temperature decrease, temperature increase and A/C switch.

CONDITIONS:
^ Engine running and at normal operating temperature.

PROCEDURE:

Trouble Diagnoses-Operational Check:

1. Check blower
1. Turn fan switch to 1-speed. Blower should operate on low speed.
2. Then turn tan switch to 2-speed.
3. Continue checking blower speed until all speeds are checked.
4. Leave blower on speed 4.

2. Check discharge air.

Trouble Diagnoses-Operational Check:

1. Press each mode switch.

Trouble Diagnoses-Operational Check:

2. Confirm that discharge air comes out according to the air distribution table.
See "Discharge Air Flow", "DESCRIPTION"

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

Trouble Diagnoses-Operational Check:

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).

Trouble Diagnoses-Operational Check:

4. Check temperature decrease
1. Slide temperature control lever to full cold.
2. Check for cold air at discharge air outlets.

Trouble Diagnoses-Operational Check:

5. Check temperature increase
1. Slide temperature control lever to full hot.
2. Check for hot air at discharge air outlets.

Trouble Diagnoses-Operational Check:

6. Check air conditioning switch
Move 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.