Peterbilt Model 320 Operator's Manual after 8-07 - Peterbilt Motors ...

PART 8: MAINTENANCE AND SERVICE
Air Conditioner
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 depressurizing
and recharging the air conditioning system
must be conducted by a qualified technician
with the right facilities to do the job.
• 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 compressed
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.
• On tilt-cab vehicles, verify that hoses are routed
around the pivot point so that lifting the cab does not
strain them.
• Check all components and connections for refrigerant
leaks. If you discover a leak, don’t try to tighten a connection.
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 annually
by your dealer.
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