Operational Check

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

CONDITIONS:
- Engine running at normal operating temperature.

PROCEDURE:




1. Check blower
a. Turn fan control knob to 1-speed.
Blower should operate on 1-speed.
b. Turn fan control knob to 2-speed, and continue checking blower speed until all speeds are checked.
c. Leave blower on 4-speed.

2. Check discharge air




a. Turn mode control knob.




b. Confirm that discharge air comes out according to the air distribution table at left.
Refer to Description and Operation, Discharge Air Flow

NOTE: Confirm that the compressor clutch is engaged (visual inspection) when the DEF mode is selected.




3. Check recirculation
a. Press recirculation switch.
Recirculation indicator should light.
b. Listen for intake door position change (you should hear blower sound change slightly).

NOTE: Recirculation does not operate in DEF mode.




4. Check temperature decrease
a. Turn temperature control knob to full cold.
b. Check for cold air at discharge air outlets.




5. Check temperature increase
a. Turn temperature control knob to full hot.
b. Check for hot air at discharge air outlets.




6. Check air conditioner switch
Turn fan control knob to the desired (1-to 4-speed) position and push the A/C switch to turn ON the air conditioner.
The indicator light should come on when air conditioner is ON.