User Manual

Heater and Air Conditioner
Maintenance
The combination heater-air conditioner
provides comfort for those in the cab
through accurate control of the cab
environment in all weather conditions.
Regular attention to the items below will
help you keep the heater-air conditioner
unit running well. Keep the vehicle's
ventilation system, engine exhaust system,
and cab joints properly maintained. It is
recommended that the vehicle's exhaust
system and cab be serviced by a
competent technician as follows:
• Inspected every 15,000 miles
• Whenever a change is noticed in
the sound of the exhaust system
• Whenever the exhaust system,
vehicle underbody, or cab is
damaged
To allow for proper operation of the vehicle
ventilation system, proceed as follows:
• 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 gas under the vehicle.
•
Check the drain tube of the fresh
air inlet for trapped water before
assuming that there is a leak in the
heating system.
Special Precautions
WARNING
Excessive heat may cause the pres-
surized
components of the air condi-
tioning system to explode. Never weld,
solder, steam clean, or use a blow
torch near any part of the air condition-
ing system. Failure to comply may re-
sult in death, personal injury, equip-
ment or property damage.
WARNING
Air conditioning refrigerant can be haz-
ardous
to your health. DO NOT ex-
pose yourself to leaking refrigerant for
prolonged periods near excessive
heat, open flames, or without proper
ventilation. Failure to do so may result
in death or personal injury
.
If a refrigerant leak develops in the
presence of excessive heat or an open
flame, hazardous gases may be
generated. If you become aware of a
refrigerant leak on your vehicle have your
system serviced immediately and observe
the following precautions: Stay away from
the hot engine until the exhaust manifold
has cooled. Do not permit any open flame
in the area. Even a match or a cigarette
lighter may generate a hazardous quantity
of poisonous gas. Do not smoke in the
area. Inhaling gaseous refrigerant through
a cigarette may cause violent illness.
MAINTENANCE - Heater and Air Conditioner Maintenance
Y53-6113-1A1 (11/20) 255
5