freightliner M2 Plus 2023 Manual page 77

Air Vent Selection Switch
The air selection switch allows you to control the flow
of air through the face, floor, and defrost vents.
Before using any of the defrost modes, clear the
screen at the base of the windshield if snow or ice is
present.
With the intermediate modes between each telltale,
there are nine modes to choose from on a system
without air conditioning, as shown in
eleven modes to choose from in a system with air
conditioning as shown in
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06/17/2003
1. Face Mode
2. ¾ Face, ¼ Floor Mode
3. ½ Face, ½ Floor Mode
4. ¼ Face, ¾ Floor Mode
5. Floor Mode
6. ¾ Floor, ¼ Defrost Mode
7. ½ Floor, ½ Defrost Mode
8. ¼ Floor, ¾ Defrost Mode
9. Defrost Mode
Fig. 5.8, Air Selection Switch Without Air Conditioning
Temperature Control Switch
Turn the switch to the left (counterclockwise) for cool
air, or to the right (clockwise) for hot. There are 21
positions on the temperature control switch.
Recirculation Mode
Press the recirculation button to prevent dusty or
smoky air from entering the cab or to decrease the
time required to cool or heat the cab interior during
extreme outside temperature conditions. When
recirculation mode is active the LED next to the
recirculation button shown in
To prevent the buildup of odors or oxygen depletion
inside the cab, after 20 minutes the system switches
Fig. 5.8, and
Fig. 5.9.
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Fig. 5.7 illuminates.
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06/18/2003
A. Air Conditioning Mode
1. Air Conditioning Face Mode
2. Air Conditioning ¾ Face, ¼ Floor Mode
3. Air Conditioning ½ Face, ½ Floor Mode
4. Air Conditioning ¼ Face, ¾ Floor Mode
5. Face Mode
6. ½ Face, ½ Floor Mode
8. ¼ Face, ¾ Floor Mode
7. Floor Mode
8. ¾ Floor, ¼ Defrost Mode
9. ½ Floor, ½ Defrost Mode
10. ¼ Floor, ¾ Defrost Mode
11. Full Defrost Mode
Fig. 5.9, Air Selection Switch With Air Conditioning
from full recirculation mode to partial recirculation
mode for five minutes. The system cycles from full to
partial recirculation as long as the mode is enabled.
Recirculation mode is not available when the air vent
selection is set to partial or full defrost mode.
Air Conditioning
The four air conditioning modes are marked in blue
on the air vent selection switch.
IMPORTANT: Operate the air conditioner at
least five minutes each month, even during cool
weather. This helps prevent drying and cracking
of the refrigerant compressor seals and reduces
the chance of refrigerant leaks in the system.
NOTE: The heating and air conditioning system
has a brushless blower motor with a protection
or shutdown mode to prevent damage due to
overheating and overcurrent conditions. If the
brushless blower motor goes into a protection
mode, the motor operates at a slower speed. If
the overheating or overcurrent condition
continues, the motor shuts down and stops
Cab Features
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5.4