Peterbilt 579 - Heater

HEATER AND AIR CONDITIONER
will allow the lter to be removed element such that it points into the Heater
in an upward direction. HVAC housing.
• Check all heater controls for
4. Insert the lter and make sure the
full-range operation.
retention tab has re-engaged to
secure the
lter.
• Check hoses, connections, and
heater core for condition and
5. Close the
bunk.
leaks.
CAUTION
During extreme cold weather, do not
blow hot defroster air onto cold wind
-
shields. This could crack the glass.
Turn the air direction lever to Defrost
and adjust the fan speed accordingly
while the engine warms. If the en
-
gine is already warm, move the tem-
perature selector to Cool, then grad-
ually increase the temperature when
you see that the windshield is starting
to warm-up.
5
3. Align the airow direction that is
indicated on the side of the lter
5-114 Y53-6047–2C (04/13)