Cab Climate Controls
NOTE: On vehicles equipped with the ICC5 instru-
ment panel, the fan speed, temperature, and mode
temporarily appear on the 10-inch infotainment
screen when these items are adjusted.
The standard cab climate controls include a fan knob
with a recirculation button, temperature control knob
with an A/C button, and a mode control knob. See
. The mode control knob in sleeper cabs is
equipped with a bunk override button.
Fan Knob
The fan knob activates the fan, which forces outside
air or recirculated air through the air outlets. The fan
knob has ten fan speed settings and an OFF posi-
tion. See
To operate the fan, turn the fan knob clockwise to
increase airflow; turn the fan knob counterclockwise
to decrease airflow.
There is a two-second delay between the time the
engine is started and the blower is operational. It can
take an additional four seconds for the blower to
reach high speed. The blower motor performs a self-
test immediately after the engine is started, which
causes the delay. If the vehicle has Optimized Idle,
the fan will not operate with the key in accessory
mode. Optimized Idle may also turn the fan off to
reduce stress on the batteries. Refer to
for more information.
Recirculation
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.
See
. Recirculation mode can also decrease
the time required to cool or heat the cab interior dur-
ing extreme outside temperature conditions. An
amber indicator on the recirculation button will illumi-
nate when the recirculation mode is activated.
The recirculation button will not work when the mode
control switch is in either defog or defrost modes.
NOTE: To prevent the buildup of odors or oxy-
gen depletion inside the cab, the system
switches from full recirculation mode to partial
recirculation mode after 20 minutes. In ex-
tremely dusty or smoky conditions, the partial
recirculation mode can be overridden by press-
ing the recirculation button twice to obtain full
recirculation mode. This resets the 20-minute
timer.
Temperature Control Knob
The temperature control knob is used to select the
desired temperature in the cab. Turn the knob coun-
terclockwise for cool air, or clockwise for hot air. See
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1
2
3
1.
Fan Knob
2.
Temperature Control Knob
3.
Mode Control Knob
Fig. 8.1, Cab Climate Controls
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1.
Recirculation Button
Fig. 8.2, Fan Knob
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1
1.
Air Conditioning Button
Fig. 8.3, Temperature Control Knob
Climate Controls
8.1
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