Fan Control

SD DM 07.00.01

The fan switch controls the rate that air is blown through the selected air outlets. It has 8 fan-speed settings, and an OFF position. See Fig.. To increase the airflow, turn the switch clockwise to a higher number. To decrease the airflow, turn the switch counterclockwise to a lower number. Setting the fan switch at the OFF position disables the cab air conditioning (A/C), and sets the air source to fresh-air mode.

  1. Climate-Control Panel

  2. Fan Switch

  3. Recirculation Button

  4. Air-Selection Switch

  5. Air-Conditioning Button

  6. Temperature-Control Switch

  7. Bunk-Override Switch

Fig. 1, Cab Climate-Control Panel

Note: When the sleeper A/C is running, even though the cab fan switch may be in the OFF position, the cab fan will operate at low speed. This is necessary to protect the evaporator in the cab HVAC system from freezing.

There is a slight delay between the time the engine is started and the blower is operational. It can take an additional 4 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.

Note:
Parent topic: Cab Climate-Control Panel
Document Number: 0000123171
Manual Publication Date: 2025-01-23
Topic Publication Date: 2025-01-23