Heating

cen dm 04.01.003
  1. With the engine at operating temperature, move the temperature control switch all the way clockwise for heat. See Fig..

    1. Fan Switch

    2. Air Selection Switch

    3. Temperature Control Switch at Warm

    4. Fresh Air/Recirculation Switch

    Fig. 1, Heating Settings

  2. Turn on the fan switch to the desired speed.
  3. Move the air selection switch to the desired setting.

    4. Important: If the windows start to fog, move the air selection switch to defrost (windshield) and make sure the fan is on. To defog the driver's door window, turn the extreme left dash-face outlet to direct airflow to the upper left.

    Note: In mild weather the fan switch can be kept off since forward motion of the vehicle will provide airflow through the heater.

  4. If the vehicle has a sleeper climate control panel, set the controls as desired. Refer to "Heating, Auxiliary Heater and Air Conditioner."
  5. When a comfortable temperature has been reached, adjust the fan switch setting and temperature control as needed to maintain the temperature.

    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.

Note:
Parent topic: Water-Valve-Controlled Heater and Air Conditioner System
Document Number: 0000118311
Manual Publication Date: 2024-05-13
Topic Publication Date: 2024-06-06