OPERATOR'S MANUAL

HEATER-AIR CONDITIONING CONTROLS CONTROLS AND DISPLAY
– 66 – Y53-6027
Medium Duty (R05/09)
Heater-Air Conditioning Controls
Your heat and air conditioning controls are mounted in the
“D” instrument panel in conventional models. Additionally,
the sleeper compartment may also contain a separate
heating and cooling system with separate controls.
WARNING! Exhaust fumes from the engine
contain carbon monoxide, a colorless and
odorless gas. Do not breathe the engine
exhaust gas. A poorly maintained, damaged, or
corroded exhaust system can allow carbon
monoxide to enter the cab or sleeper. Entry of
carbon monoxide into the cab is also possible
from other vehicles nearby. Failure to properly
maintain your vehicle could cause carbon
monoxide to enter the cab/sleeper, causing
death, injury or serious illness.
WARNING! Never idle your vehicle for pro-
longed periods of time if you sense that
exhaust fumes are entering the cab or sleeper.
Investigate the cause of the fumes and correct
it as soon as possible. If the vehicle must be
driven under these conditions, drive only with
the windows open. Failure to repair the source of the
exhaust fumes may lead to death, injury or personal
harm.
NOTES:
•Keep the engine exhaust system and the vehi-
cle’s cab/sleeper ventilation system properly
maintained. It is recommended that the vehicle’s
exhaust system and cab/sleeper be inspected:
– By a competent technician every 15,000 miles
– Whenever a change is noticed in the sound of
the exhaust system
– Whenever the exhaust system, underbody, cab
or sleeper is damaged
•To allow for proper operation of the vehicle venti-
lation system, keep the inlet grille at the base of
the windshield clear of snow, ice, leaves and
other obstructions at all times.