Peterbilt Medium Duty Truck Owner's Manual - Peterbilt Motors

CONTROLS AND DISPLAY
CAUTION: During extreme cold weather, do not
blow hot defroster air onto cold windshields.
This could crack the glass. Turn the air flow control
lever to Defrost and adjust the fan speed
accordingly while the engine warms. If the
engine is already warm, move the temperature
selector to Cool, then gradually increase the
temperature when you see that the windshield is
starting to warm up.
• To cool the cab, turn on the A/C switch, set the temperature
knob to cool (the blue position on the control),
and the blower to high until the cab becomes
cool. Then you can turn down the blower if you wish.
For Efficient Cooling:
1. Be sure all heater - air conditioner controls are off.
2. Start the engine. Allow time for warm-up.
CAUTION: A cold compressor can cause
refrigerant to liquefy and warp the valve
plates or cause a hydraulic lock. Warm the
engine before starting the air conditioner.
CAUTION: To avoid damage to the compressor
& blower motors, turn off all controls
when a system is not in use.
3. Set the air control in the RECIRC mode.
CIGARETTE LIGHTER
4. Close all windows.
5. Idle the engine between 1000 and 1500 RPM and
turn the blower speed control to High.
6. After the cab temperature cools to a comfortable level,
adjust the blower speed and controls to keep the
desired condition.
NOTE: When the air conditioner is not in regular
use, operate it for at least 15 minutes at least
once a month or every 5,000 miles (8,000 Km),
whichever comes first. This will lubricate the seals
in the air conditioning system. The air conditioning
system is active when the Defrost mode is
selected.
Cigarette Lighter
02912A
The cigarette lighter is located at the bottom of the cup
holders. To operate your lighter, push the center of the
knob in. After a few moments the lighter will automatically
pop out, ready to use. After use, insert the knob, but do
Medium Duty (R05/09) Y53-6027 – 69 –