Medium Duty Operator's Manual - Peterbilt Motors Company

CONTROLS AND DISPLAY
•If you are required to idle your vehicle for
long periods of time, install an auxiliary
heater or automatic idle control. These auxiliary
devices can reduce fuel consumption
and save you money.
•If other vehicles are parked next to you
idling, move your vehicle or do not stay in
your vehicle for prolonged periods of time.
•When idling for short periods of time
–Set the heating or cooling system to Heat or A/
C
–Set the fan to Medium or High speed
–Set the controls to FRESH AIR
To Set the Heater-Air Conditioning Controls
Conventional Cab:
The Conventional cab's controls will have one control unit
on the dash, and may have a rocker switch for the bunk
control unit (see illustrations that follow):
HEATER-AIR CONDITIONING CONTROLS
• A rotary knob (A) in the left portion controlling the
blower speed with five settings (including OFF).
• A rotary knob (B) in the center portion controlling the
movement of air within the cab. This control is continuously
variable through five modes (clockwise from
left):
– Panel
– Panel/Floor
–Floor
– Defrost/Floor
–Defrost
• A rotary knob (C) in the right portion controlling the air
temperature.
• A push button switch (D) in the center left portion to
engage the air conditioner compressor (only vehicles
with air conditioning).
• A push button switch (E) in the center right portion to
select either fresh- or recirculated-air mode.
Medium Duty (R05/09) Y53-6008A – 65 –