Heater
PART 8: MAINTENANCE AND SERVICE
controller for that axle to go into the fail-safe mode, and the
warning light will give a shutdown signal. In this case, the
anti-lock system can be turned back on, and the warning
light extinguished, by turning the key switch OFF and ON,
after the vehicle has been brought to a full stop. When the
key switch is turned back on, the warning light will illuminate
and remain on for 3 to 5 seconds. This is a built-in function
test of the warning light.
Cab Heater-Air Conditioner
The combination heater-air conditioner provides comfort
for those in the cab through accurate control of the cab en-
vironment in all weather conditions. Regular attention will
help you keep your unit running well.
NOTE: Keep the engine exhaust system and the
vehicle’s cab ventilation system properly main-
tained.
It is recommended that the vehicle’s
exhaust system and cab 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, or
cab is damaged
• Allow for the proper operation of the vehicle ven-
tilation system:
• Keep the inlet grille at the base of the windshield
clear of snow, ice, leaves, and other obstructions
at all times.
• Keep the exhaust pipe area clear to help reduce
the buildup of exhaust gases under the vehicle.
Perform the following checks every 3 months or 30,000
miles / 48,000 km, whichever occurs
fi
rst:
Heater
• Check all heater controls for full-range operation.
• Check hoses, connections, and heater core for condi-
tion and leaks.
• Check the drain pan of the fresh air vent for trapped
water before assuming that there is a leak in the heat-
ing system.
• If the heater core is leaking, take the vehicle to a Pe-
terbilt dealer for proper heater service or repair.
• Check the heater core for debris blocking the air
fl
ow. If
the blower is functioning properly, yet the heater is not
– 184 –
Y53-6015
R(08/07)
Summary of Contents for Peterbilt 320
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Page 210: ...PART 11 SUBJECT INDEX Windshield Washer Reservoir 29 206 Y53 6015 R 08 07 ...
Page 212: ...Peterbilt Motors Company P O Box 90208 Denton Texas 76202 ...