General Information
The cab climate control panel allows you to control all of the heating, air conditioning, defrosting, and ventilating functions. See Fig. or see Fig..
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Fan Switch
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Air Selection Switch
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Temperature Control Switch
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Maximum Air Conditioning
Fig. 1, Climate Control Panel, Heater and Air Conditioning
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Fan Switch
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Air Selection Switch
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Temperature Control Switch
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Fresh Air/Recirculation Switch
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Bunk Fan Switch
Fig. 2, Climate Control Panel, Heater Only
A four-speed fan forces fresh or recirculated air to any selected air outlets at the windshield, door windows, dashboard face, and cab floor.
An air selection switch controls the direction of warm or cool air to the face and feet, face only, feet only, feet and windshield, or windshield only (defrost).
A temperature control switch is used to select the desired temperature. Turn the switch counterclockwise for cool air, or clockwise for warm air.
All of the dash-face outlets have adjustable louvers that pivot right, left, up, and down. The outlets can be closed by moving the louvers all the way down. Windshield defrost outlets and the passenger's door window defrost outlet have nonadjustable louvers. The bunk outlet (at the right-hand rear corner of the bunk) has two sets of vertical louvers that operate like the horizontal dash-face louvers.
The sleeper heater and air conditioner is installed in the right-side baggage compartment and uses the cab's refrigerant system for air conditioner operation. The sleeper heater and air conditioner is equipped with a separate evaporator coil, expansion valve, and fan. It is also equipped with its own heater core and water valve, independent of the cab heater. The sleeper climate control panel is mounted on the right rear wall or the rear overhead storage compartment. See Fig..
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Temperature Control Switch
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Fan Switch
Fig. 3, Sleeper Climate Control Panel
Note: Shutting off the heater supply gate valve, if equipped, on the engine limits the ability to control air conditioning temperature in the cab and in the sleeper. With the valve shut off, warm coolant is no longer available from the engine and the outlet air temperature controls can't be used to change air temperature.
A fresh air/recirculation switch is standard equipment when there is no air conditioning. See Fig.. This control is an option when air conditioning is ordered. It allows the cab to be ventilated with either fresh or recirculated air. When the air selection switch is rotated to the maximum air conditioning position, the system uses only recirculated air, regardless of whether fresh or recirculated air has been selected. See Fig..
When the air selection switch is set to air conditioning and recirculated air has been selected, the system functions the same as when the air selection switch is set at maximum air conditioning.
The fan bunk switch on the cab climate control panel overrides the sleeper climate control panel. See Fig.. For increased ventilation in the sleeper, put the switch in the HI position. For normal fan and temperature operation, put the switch in the middle position. To turn the fan in the sleeper off, put the switch in the OFF position.
Note: When the bunk fan switch is in the OFF position, the sleeper temperature control will default to the heat mode. The sleeper fan will blow hot air when any air conditioning mode is selected. To operate the temperature controls, move the bunk fan switch to the middle position.
A cab exhaust system is included with sleeper cabs. When the climate control unit is set for fresh air, 300 cubic feet per minute of air is provided to the sleeper cab and exhausted through a vent in the left rear area of the sleeper. When the system is activated, fresh air rapidly displaces stale air as the cab pressurizes.
Important: To prevent the buildup of fumes or odors inside the cab (for example, from smoking), do not operate the heater and air conditioning system in a recirculation mode for more than 20 minutes.