9.
Defrost Mode: Directs all airflow through the
defrost outlets.
Air Selection Switch With Air
Conditioning
1.
Air Conditioning Face Mode: Directs all airflow
through the face or instrument panel outlets.
2.
Selection between the Air Conditioning Face
Mode and the Air Conditioning Bi-Level
Mode: Directs 75 percent of the airflow to the
face outlets and 25 percent to the floor outlets.
3.
Air Conditioning Bi-Level Mode: Directs the
airflow equally to the face outlets and the floor
outlets.
4.
Selection between the Air Conditioning Bi-
Level Mode and the Face Mode: Directs 25
percent of the airflow to the face outlets and 75
percent to the floor outlets.
5.
Face Mode: Directs all airflow through the face
outlets.
6.
Selection between Face Mode and Floor
Mode: Directs the airflow equally through the
face outlets and the floor outlets.
7.
Floor Mode: Directs all airflow through the floor
outlets.
8.
Selection between Floor Mode and Floor/
Defrost Mode: Directs 75 percent of the airflow
through the floor outlets and 25 percent through
the defrost outlets.
9.
Floor/Defrost Mode: Directs the airflow equally
to the floor outlets and the defrost outlets. The
recirculation button will not work in this mode.
10.
Selection between Floor/Defrost Mode and
Defrost Mode: Directs 75 percent of the airflow
through the defrost outlets and 25 percent
through the floor outlets. The recirculation button
will not work in this mode.
11.
Defrost Mode: Directs all airflow through the
defrost outlets. The recirculation button will not
work in this mode.
Temperature Control Switch
The temperature control switch is used to select the
desired temperature. Turn the switch to the left
(counterclockwise) for cool air, or to the right (clock-
wise) for hot air. There are 21 positions on the tem-
perature control switch ranging from full cool air to
full hot air.
Fresh Air Mode
Fresh air, or outside air, is circulated through the
heating and air conditioning system unless the recir-
culation mode, if equipped, is turned on.
Recirculation Mode
The recirculation mode is only available on vehicles
with air conditioning.
The recirculation mode limits the amount of outside
air entering the cab. Press the recirculation button to
prevent dusty or smoky air from entering the cab.
The recirculation mode can also be used to decrease
the time required to cool or heat the cab interior dur-
ing extreme outside temperature conditions. When
the recirculation mode is on, the recirculation indica-
tor will illuminate. See
Fig. 7.2.
The recirculation mode is not available when the air
selection switch is in one of the following modes:
•
floor/defrost mode
•
selection between floor/defrost mode and de-
frost mode
•
defrost mode
When the recirculation mode is turned on, it will stay
on for 20 minutes, or until the recirculation button is
pressed again, or the air selection switch is turned to
a defrost mode.
IMPORTANT: The HVAC system enters a partial
recirculation mode for five minutes after being in
full recirculation mode for 20 minutes. This cycle
repeats every 20 minutes.
Defrosting
Before using any of the defrost modes, clear the
screen at the base of the windshield if snow or ice is
present.
Air Conditioning
There are four air conditioning modes on the air se-
lection switch. The air conditioning settings on the air
selection switch are blue, in addition to the selection
Heater, Ventilating, and Air Conditioner (HVAC)
7.3
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