PART 8: MAINTENANCE AND SERVICE CAB HEATER-AIR CONDITIONER
(R10/06) Y53-6007 – 193 –
• Check the heater core for debris blocking the air flow.
If the blower is functioning properly, yet the heater is
not operating properly, the heater core may be
clogged. Clean the heater core if necessary. If the
condition persists, take the vehicle to a Peterbilt
dealer for proper heater service or repair.
Air Conditioner
WARNING! The air conditioning system is
under pressure. If not handled properly, it
could explode, causing injury to you and your
vehicle. Any servicing that requires depres
-
surizing and recharging the air conditioning
system must be conducted by a qualified
technician with the right facilities to do the
job.
• Check the compressor belt condition and proper ten-
sion. Adjust 105 - 125 pounds.
• Check the compressor and drive clutch for noise and
vibration. If you find problems, have the system
checked thoroughly. A malfunctioning clutch usually
indicates trouble elsewhere in the system.
• Check the evaporator core and condenser core for
debris restricting air flow. Clean if necessary. Small
particles may be removed with compressed air blown
through the core in the opposite direction of normal air
flow.
WARNING! Small particles blown by com-
pressed air could injure your eyes. Wear eye
protection any time you blow compressed air.
• Check all hoses for kinks, deterioration, chafing, and
leaks. Adjust kinked or chafing hoses to eliminate
restrictions and prevent further wear.
• Check all components and connections for refrigerant
leaks. If you discover a leak, don’t try to tighten a con
-
nection. Tightening a connection may cause a worse
leak. Have a qualified technician correct the problem.
NOTE: A leaking evaporator or condenser core
cannot be repaired; it must be replaced.
• Have the air conditioning system fully inspected annu-
ally by your dealer.
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