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3-21
Section 3 - Operation
Cab Controls & Instruments
Climate Controls
Heater
Before activating the heater, open the heater valve on
the rear/right side of the engine block (1). Under most
cold-weather conditions it is not necessary to have the
valve completely open.
During hot weather, shut the heater valve off. This will
ensure that no engine coolant will flow into the heater
core.
Make sure the air conditioner is deactivated except
during defrosting. To increase the cab interior
temperature for cold weather operation, start the engine
and make sure the coolant temperature bar graph
indicates two or more bars. Rotate the temperature
control switch (3) to increase the temperature. Adjust
the fan speed switch (4) to increase or decrease air
flow.
Air Conditioning Operation
CAUTION: THE AIR CONDITIONING SYSTEM USES
R134A REFRIGERANT. DO NOT MIX WITH OTHER
REFRIGERANTS. DO NOT ATTEMPT TO TOP OFF
THE SYSTEM WITH ANY OTHER REFRIGERANTS.
CONSULT A QUALIFIED TECHNICIAN FOR ALL AIR
CONDITIONING REPAIRS.
The climate controls consist of a rocker switch (2)
which activates the air conditioning, and two rotary
switches, controlling the temperature (3) and the
pressurizer fan (4).
Depress the top of the air conditioning rocker switch
(2) to activate the air conditioner. Depress the bottom
of the switch to deactivate the air conditioner.
The temperature control switch (3) is used to maintain
a constant temperature. Rotate the temperature
control switch counterclockwise to increase cooling.
Adjust the fan speed switch (4) to increase or decrease
air flow.
To aid in defrosting the windshield and side windows
the air conditioner and heater may be operated at the
same time. The air conditioner will remove moisture
from the air while the heater warms the air in the
cab. When the windows are clear, deactivate the air
conditioner.
F3-22
AUTO TEMP CONTROL
2 3 4
F3-21
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