Instruments and Controls Getting to Know Your Vehicle
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Defogging
NOTE: If equipped with
optional air conditioning, the
air conditioning system is
active when the Defrost mode
is selected.
To defog the windshield: select air dis-
tribution to Windshield or between
Windshield/Floor and turn the fan
speed switch (1) to high. Set the tem-
perature control (3) to hot (red position
on the control). The air conditioner (if
equipped) is automatically activated to
remove moisture from the cab. After the
windshield is clear, adjust the controls
as desired.
Cooling
To cool the cab: turn on the air condi-
tioner (if equipped) (switch 4), set the
temperature control (3) to cool (blue
side), and the fan (1) to high until the
cab becomes cool—adjust as desired.
When set to Recirc mode, the air condi-
tioning system will automatically shut
off fresh air intake and will recirculate
cab air.
For Efficient Cooling:
1. Ensure all heater/air conditioner
controls are off.
2. Start the engine. Allow time for
warm–up.
NOTE: A cold compressor can
cause refrigerant to liquefy and
warp the valve plates or cause
a hydraulic lock. Warm the
engine before starting the air
conditioner.
3. Set the air conditioner for maximum
cooling.
4. Close all windows.
5. Idle the engine between 1,000 and
1,500 rpm and turn the fan switch
to High.
6. After the cab temperature cools to
a comfortable level, adjust the fan
speed and other controls to keep
the desired condition.
7. For efficient air flow in fresh air
mode, regularly clean the HVAC fil-
ter located on the bottom of the
cab. First, place the system in
“recirc” mode and then clean the fil-
ter with a low pressure air hose.
• If the air conditioner does not cool
the air, have the unit checked at an
Authorized Service Center.
NOTE: When the air condi-
tioner isn’t in regular use, oper-
ate it for at least 15 minutes at
least once a month or every
5,000 miles (8,000 km), whichever
comes first. This will lubricate the seals
in the air conditioning system.
PB1340A.book Page 37 Friday, September 1, 2000 7:40 AM
