Climate Controls Climate Control Options On vehicles equipped with ATC, the AUTO setting on the fan switch places the heater and air conditioner system in the automatic fan speed control mode. When the fan switch is set to AUTO, the fan speed will vary as necessary to maintain the temperature set by the user. The climate control panel allows you to control the heating, ventilating, defrosting, and air conditioning functions. Western Star vehicles have several heater and air conditioner options. Options for the cab include: Temperature Control Switch heater only heater and air conditioner To select the desired temperature:
heater and air conditioner with automatic tem- perature control (ATC) Vehicles Without ATC: Turn the switch to the left (counterclockwise) for cool air, or to the right (clockwise) for hot air. Vehicles With ATC: Press and release the right side of the temperature up/down switch to in- crease the temperature to the desired setting. Press and release the left side of the tempera- ture up/down switch to decrease the tempera- ture to the desired setting. Press and hold the temperature up/down switch to change the de- sired temperature in large increments. Options for a sleeper unit include:
no heater or air conditioner heater only heater and air conditioner heater and air conditioner with ATC The ATC feature automatically controls the heating and cooling system to maintain the cab and sleeper air temperature close to the temperature set by the user. The ATC adjusts the air temperature blown through the air outlets to maintain the selected tem- perature. Mode Control Switch The mode control switch allows the driver to control the flow of air through the face outlets, the floor out- lets, the defrost (windshield) outlets, or a combination of these outlets to provide six air selection modes. See Fig. 5.3 . Cab Climate Control Panels Face Mode (using recirculating air):
Directs all airflow through the face or instrument panel outlets, using recirculated air. The standard cab climate control panel has a fan switch, a temperature control switch, and a mode control switch that allows the driver to control heat- ing, cooling, defrosting, and ventilating. The control panel may also be equipped with an optional A/C switch and/or an optional BUNK switch. See Fig. 5.1 . Face Mode (using fresh air): Directs all airflow through the face or instrument panel outlets, using fresh air. Vehicles equipped with ATC have an LED display. See Fig. 5.2 . Bi-Level Mode: Directs the airflow equally to the face outlets and the floor outlets. Controls Fan Switch Floor Mode:
Directs all airflow through the floor outlets. Floor/Defrost Mode: Directs the airflow equally to the floor outlets and the defrost outlets. The fan switch activates the fan, which forces fresh air or recirculated air through the air outlets. The fan switch has four fan speed settings and an off posi- tion. See Fig. 5.1 . Defrost Mode: Directs all airflow through the defrost outlets. To operate the fan switch, turn the fan switch clock- wise to increase airflow; turn the fan switch counter- clockwise to decrease airflow. NOTE: The face mode using recirculating air is the only mode that recirculates the air in the cab. All other modes draw in fresh air from out- side the vehicle. 5.1