Peterbilt 579 - Operating Tips

HEATING AND AIR CONDITIONING
3
Temperature Control Dial
The cab
temperature is set using the
temperature control dial. The operating
range is 60°F (16°C) and 84°F (28°C).
Adjustments of 2° increments.
Temperature Control Set Point
The button inside the temperature
control dial engages the A/C
compressor. When activated the
indicator on the button will illuminate.
During AUTO mode, the A/C button
indicator will remain illuminated at all
times even though the compressor
may be cycling.
Air Conditioner Button
NOTE
Fan control dial must also be in the
ON position to engage the A/C com
-
pressor. A/C engages automatically in
AUTO, defrost and oor/defrost.
Operating Tips
Defrosting and Defogging the
Windshield
The cab
windshield and side windows
can be cleared of ice and fog in two
ways. The rst is to use the MAX
defrost mode (See MAX defrost
section). The second is to manually
adjust the air distribution dial to the
defrost position.
CAUTION
During extreme cold weather, do not
blow hot defroster air onto cold wind
-
shields. This could crack the glass.
Turn the Air Flow Control Dial to
Defrost and adjust the fan speed ac
-
cordingly while the engine warms. If
the engine is already warm, move the
Temperature Control Dial to cool, then
gradually increase the temperature
when you see that the windshield is
starting to warm up. Failure to comply
may result in equipment damage.
3-86 Y53-6047–2C (04/13)