Operational Check

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 the front fan switch 10 1-speed and press any mode switch except OFF.
Blower should operate on 1-speed.
b. Then turn the front fan switch to 2-speed and continue checking blower speed until all four speeds are checked.
c. Leave blower on 4-speed.

2. Check discharge air





a. Press each mode switch.





b. Confirm that discharge air comes out according to the air distribution table at left and that the indicator lamp illuminates.
Refer to "Discharge Air Flow", "DESCRIPTION".

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





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

NOTE: REC does not operate in DEF and F/D modes.





4. Check temperature decrease
a. Turn the front temperature control switch to full cool.
b. Check for cold air at discharge air outlets.





5. Check temperature increase
a. Turn the front temperature control switch to full warm.
b. Check for hot air at discharge air outlets.





6. Check air conditioner switch
Turn the front fan switch on and press the desired mode switch, then press the air conditioner switch to turn ON the air conditioner.
The indicator lamp should come on when air conditioner is ON.

REAR A/C CONDITIONS:

Engine running at normal operating temperature.

PROCEDURE:





1. Check blower
a. Set rear fan switch (front) to REAR position.
b. Press any mode switch except OFF.
c. Press A/C switch ON.
d. Turn rear fan switch to 1 -speed.
Blower should operate on 1-speed.
e. Turn rear fan switch to 2-speed.
f. Continue checking blower speed until all four speeds are checked.

2. Check discharge air





a. Press the UPPER side of the rear vent switch.
The indicator should light and confirm air flow from the upper rear discharge outlets.





b. Press the LOWER side of the rear vent switch.
The indicator should light and confirm air flow from the lower rear discharge outlets.





3. Check temperature decrease
a. Turn the rear temperature control switch to full cool.
b. Check for cold air at rear discharge outlets.





4. Check temperature increase
a. Turn the rear temperature control switch to full warm.
b. Check for hot air at rear discharge outlets.