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Mix
Outside air flows in equal proportions through the
floor and defroster outlets.
Defrost
Outside air is primarily directed to the windshield
through the defroster outlets located at the base of
the windshield, and the demister outlets located at the
edge of each side of the instrument panel.
NOTE:The air conditioner compressor operates in both
Mix and Defrost or a blend of these modes, even if the
A/C button has not been pressed. This dehumidifies the
air to help dry the windshield.
Blower Control
The rotary knob on the left of
the control panel is the
blower control. Turn the knob
clockwise to one of the four
positions to obtain the blower
speed you desire. To turn the
blower off, turn the knob to
the far left position.
INSTRUMENT PANEL AND CONTROLS 177
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Temperature Control
The rotary knob at the center
of the control panel controls
the temperature of the inte-
rior air. You can choose your
degree of comfort by rotating
the knob. The coldest tem-
perature setting is to the ex-
treme left (blue region) and
the warmest setting is to the
extreme right (red region) of
the rotation.
Circulation
The cab is designed with features to promote outside air
circulation. There are grilles in the cab back panel. These
are air exhausters that provide the means for regular
exchange of cab air.Side window demisters direct air flow specifically to the
window glass to help prevent interior fogging of the
glass. They are located in the extreme outside upper
edges of the instrument panel. The demisters also pro-
vide extra air ducts for circulation. They are in operation
whenever the Floor, Mix, Defrost, or Bi-Level modes are
in use.
NOTE:When you turn off the engine you may hear a
hissing sound from under the hood for a short period of
time. This is a normal condition that occurs if the air
conditioning system has been on. It is not an indication of
a problem with the air conditioning system.Operating Tips
Fast Cooldown
For a fast cooldown, open the windows and turn the
blower fan rotary knob to the extreme right position, turn
the mode control to the panel fresh position, press the
snowflake button to turn on the air conditioning, and
178 INSTRUMENT PANEL AND CONTROLS
Page 179 of 400

drive with the windows open for the first few minutes.
Once the hot air has been expelled, close the windows
and turn the mode selector to the Recirculation Panel
Mode or Recirculation Mode Bi-level position. When a
comfortable condition has been reached, choose a mode
position and adjust the temperature control knob and
blower speed as necessary to maintain comfort. For high
humidity conditions it may be necessary to remain in the
Recirculation mode to maintain comfort.
Window Fogging
Windows will fog on the inside when the humidity inside
the vehicle is high. This often occurs in mild or cool
temperatures when it’s rainy or humid. In most cases
turning on the Air-conditioning (pressing the snowflake
button) will clear the fog. Adjust the temperature control,air direction and blower speed to maintain comfort.
As the temperature gets colder it may be necessary to
direct air onto the windshield by using MIX Mode
position on the control. Adjust the temperature control
and blower speed to maintain comfort. High blower
speeds will reduce fogging. Interior fogging on the
windshield can be quickly removed by selecting the
defrost mode.
Regular cleaning of the inside of the windows with a
non-filming cleaning solution (vinegar and water works
very well) will help prevent contaminates (cigarette
smoke, perfumes, etc.) from sticking to the windows.
Contaminates on the inside of windows can increase the
rate of window fogging.
INSTRUMENT PANEL AND CONTROLS 179
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Summer Operation
Air conditioned vehicles must be protected with a high
quality antifreeze coolant during summer to provide
proper corrosion protection and to raise the boiling point
of the coolant for protection against overheating. A 50%
concentration of engine coolant to distilled water is
recommended. See “Cooling System” in the Maintaining
Your Vehicle section of your Owner’s Manual.
When using the air conditioner in extremely heavy traffic
in hot weather especially when towing a trailer, addi-
tional engine cooling may be required. If this situation isencountered, operate the transmission in a lower gear.
When stopped in heavy traffic, it may be necessary to
shift into NEUTRAL and depress the accelerator slightly
for fast idle operation.
Winter Operation
When operating the system during the winter months,
make sure the air intake, located directly in front of the
windshield, is free of ice, slush, snow, or other obstruc-
tions. This will help prevent snow going into the ducts.
180 INSTRUMENT PANEL AND CONTROLS
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Operation Tips Chart
INSTRUMENT PANEL AND CONTROLS 181
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Page 183 of 400
STARTING AND OPERATING
CONTENTS
Starting Procedures.....................187
▫Manual Transmission..................187
▫Automatic Transmission................187
▫Normal Starting......................188
▫If Engine Fails To Start.................188
▫After Starting........................189
Engine Block Heater — If Equipped.........189
Automatic Transmission..................190
▫Brake/Transmission Interlock System.......191▫Automatic Transmission................191
Manual Transmission....................196
▫Recommended Shift Speeds..............197
▫Downshifting........................198
Four-Wheel Drive Operation...............199
▫NV233/243 GII Transfer Case Operating
Information/Precautions................199
▫Shifting Procedure - NV233/243
Transfer Case........................202
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▫NV 244 Generation II Transfer Case Operating
Information / Precautions...............205
▫Shifting Procedure - NV 244 Generation II Transfer
Case..............................209
Limited-Slip Rear Axle Differential— If Equipped 210
Driving On Slippery Surfaces..............211
Parking Brake.........................212
Brake System..........................213
▫Rear Wheel Anti-Lock Brake System –
If Equipped.........................213
▫Four-Wheel Anti-Lock Brake System........214
Power Steering........................216
Rocking The Vehicle.....................217
Tire Safety Information...................218▫Tire Markings........................218
▫Tire Identification Number (TIN)..........221
▫Tire Loading And Tire Pressure...........222
Tires — General Information...............226
▫Tire Pressure.........................226
▫Tire Inflation Pressures.................227
▫Radial-Ply Tires......................229
▫Compact Spare Tire — If Equipped.........230
▫Limited Use Spare — If Equipped.........231
▫Tire Spinning........................231
▫Tread Wear Indicators..................232
▫LifeOfTire .........................233
▫Replacement Tires.....................233
184 STARTING AND OPERATING