Cab Climate Control
Note: See General Information for detailed climate control panel operating instructions.
The cab climate control panel has three switches to control the functions of the cab temperature system: ventilation, heating and cooling, air conditioning and dehumidifying, and defrosting for the windshield. See Fig..
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fan switch with recirculation button
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temperature control switch with A/C button
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mode control switch (with bunk-override button on sleeper cab only)
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Fan Switch
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Temperature Control Switch
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Mode Control Switch
Fig. 1, Cab Climate Controls
The fan switch controls the fan speed, and forces fresh or recirculated air through the air outlets. To increase airflow, turn the switch clockwise to a higher number. To decrease airflow, turn the switch counterclockwise to a lower number.
Recirculation mode limits the amount of outside air that enters the cab. Press the recirculation button to prevent dusty or smoky air from entering the cab.
Note: To prevent the buildup of odors and/or oxygen depletion inside the cab, the system switches from full recirculation mode to partial recirculation mode after 20 minutes.
The temperature control switch is used to select the desired temperature. Turn the switch clockwise to the red area for warm air. Turn the switch counterclockwise to the blue area for cool air.
The A/C cools and dehumidifies the air inside the cab. Press the A/C button, located in the center of the temperature control switch, to turn the A/C on and off.
The mode control switch allows the control of air flow through the face outlets, the floor outlets, the defrost (windshield) outlets, or a combination. See Fig..
There are intermediate modes between each switch position.
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Face Mode
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Bi-Level Mode
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Floor Mode
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Floor/Defrost Mode
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Defrost Mode
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All Mode
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Bunk Override Button (on sleeper-cabs only)
Fig. 2, Mode Control Switch With Bunk Override Button
Bunk-Override Button
In sleeper-cabs, the bunk-override button is located in the center of the cab air-selection switch. See Fig.. The bunk override button allows the driver to control the sleeper temperature and fan settings from the cab.
Press the bunk override button to copy the current cab HVAC temperature and fan settings to the sleeper HVAC. An amber indicator will illuminate when bunk override mode is activated. When in override mode, the sleeper climate control panel automatically conforms to the fan speed and temperature settings on the cab climate panel at the time the override mode is activated. Further changes of the cab climate control settings will not alter the settings of the sleeper climate control panel.
The override mode is disabled when the fan switch or temperature control switch on the sleeper climate control panel is manually set to a different setting.
Press the bunk override button a second time to turn the override function off.