PART 8: MAINTENANCE AND SERVICE
PB1319 (CAT. NO. 5296 ) —158— 22-01691 (R02/02)
• Check hoses, connections, and heater core for condition and leaks.
• Check the drain pan of the fresh air vent for trapped water before
assuming that there is a leak in the heating system.
• If the heater core is leaking, take the vehicle to a Peterbilt dealer
for proper heater service or repair.
• Check the heater core for debris blocking the air flow. If the
blower is functioning properly, yet the heater is not operating prop-
erly, the heater core may be clogged. Clean the heater core if nec-
essary. If the condition persists, take the vehicle to a Peterbilt
dealer for proper heater service or repair.
Air Conditioner (Optional)
Special Precautions
• Check the compressor belt for condition and proper tension.
Adjust 105 - 125 pounds (467 - 556 N.).
• Check the compressor and drive clutch for noise and vibration. If
you find problems, have the system checked thoroughly. A malfunc-
tioning clutch usually indicates trouble elsewhere in the system.
WARNING! The air conditioning system is under pres-
sure. If not handled properly, it could explode, causing
injury to you and your vehicle. Any servicing that
requires depressurizing and recharging the air condi-
tioning system must be conducted by a qualified techni-
cian with the right facilities to do the job.
NOTE: Engines equipped with poly-vee belts are equipped
with tensioners. No belt adjustments can be made. Replace
a poly-vee belt when the indicator on the tensioner is no
longer within the recommended (green) range.
WARNING! Excessive heat may cause your air condi-
tioning system to explode. Never weld, solder, steam
clean, or use a blow torch near any part of the air condi-
tioning system. If a refrigerant leak develops in the
presence of excessive heat or an open flame, hazardous
gases may be generated. These gases may cause
unconsciousness or death. If the system is leaking
refrigerant:
•
Stay away from the hot engine until the exhaust mani-
fold has cooled.
•
Don’t permit any open flame in the area. Even a match
or a cigarette lighter may generate a hazardous quan-
tity of phosgene gas.
•
Don’t smoke in the area. Inhaling gaseous refrigerant
through a cigarette may cause violent illness.
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