2004 JEEP GRAND CHEROKEE air conditioning

Heated Seats Ð If Equipped
This feature heats the driver's and passenger's front
seats. The controls for the heated seats are located on the
instrument panel below the heater/air conditioning con-
trols. After turning on the ignition you can choose from
HI, OFF, or LO heat settings.An indicator on the switch shows which setting has been
selected. To turn off the heated seats, position the switch
in the middle.
60/40 Split Rear Seat
Either side of the rear seat can be folded flat to allow for
extended cargo space and still maintain some rear seating
room.
NOTE:Be sure that the front seats are fully upright and
positioned forward. This will allow the rear seatback to
fold down easily.
UNDERSTANDING THE FEATURES OF YOUR VEHICLE 71
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mRemote Sound System Controls Ð If Equipped . . 160
NRadio Operation......................161
NTape Player.........................161
NCD Player Ð Single Disc In Radio.........162
NCD Player Ð 10 Disc In Cargo Area........162
mCassette Tape And Player Maintenance.......162
mCD/DVD Disc Maintenance...............163
mRadio Operation And Cellular Phones........164
mClimate Controls.......................164
NAir Conditioning.....................164NBlower Control.......................165
NTemperature Control...................165
NMode Selection.......................166
NInfrared Dual-Zone Climate Control Ð If
Equipped...........................167
NWindow Fogging.....................170
mRear Window Features...................170
NRear Window Wiper/Washer.............170
NRear Window Defroster.................171
UNDERSTANDING YOUR INSTRUMENT PANEL 125
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either too high or too low. Examine the gages carefully,
and follow the instructions above for each indicated
problem.
NOTE:When the ignition switch is turned to OFF, the
fuel gage, voltmeter, oil pressure, and temperature gages
will not show any readings. When the engine is not
running, turn the ignition switch to ON to obtain accu-
rate readings.
12. Part Time Indicator Light
This light alerts the driver that the vehicle is in
the PART TIME four±wheel drive mode, and
the front and rear driveshafts are mechanically
locked together forcing the front and rear wheels to rotate
at the same speed.
13. Transmission Over Temperature Warning Light
This light indicates that there is excessive transmis-
sion fluid temperature that might occur with severe
usage such as trailer towing or snow plowing. If this lightcomes on, stop the vehicle and run the engine at idle or
faster, with the transmission in N (Neutral) until the light
goes off.
14. Temperature Gage
Indicates engine coolant temperature. Any read-
ing within the normal range indicates that the
cooling system is operating satisfactorily.
The gage pointer will likely indicate a higher temperature
(above center scale) when driving in hot weather, up
mountain grades, or when towing a trailer. It should not
be allowed to exceed the upper limits of the normal
operating range.
If the pointer rises to the 260É (Hot) mark, pull over and
stop the vehicle. Do not turn the engine off. Idle the
vehicle with the air conditioning turned off, until the
pointer drops back into the normal range.
UNDERSTANDING YOUR INSTRUMENT PANEL 131
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6. Do not expose the disc to direct sunlight.
7. Do not store the disc where temperatures may become
too high.
RADIO OPERATION AND CELLULAR PHONES
Under certain conditions, the cellular phone being On in
your vehicle can cause erratic or noisy performance from
your radio. This condition may be lessened or eliminated
by relocating the cellular phone antenna. This condition
is not harmful to the radio. If your radio performance
does not satisfactorily ªclearº by the repositioning of the
antenna, it is recommended that the radio volume be
turned down or off during cellular phone operation.
CLIMATE CONTROLS
Air Conditioning
The controls for the heating/air conditioning and venti-
lation system in this vehicle consist of a series of rotary
knobs. These comfort controls can be set to obtain desired
interior conditions.
Air conditioning can be obtained by depressing the
ªA/Cº button on the control panel and setting the
appropriate rotary knobs to obtain the desired comfort
level.
164 UNDERSTANDING YOUR INSTRUMENT PANEL

level is displayed the system will maintain that level
automatically using the heating system. Should the de-
sired comfort level require air conditioning, the system
will automatically make the adjustment.
You may notice the blower speed getting lower as the
difference between the driver and passenger temperature
settings gets larger. This is an extreme condition and the
airflow may not perform as anticipated.
The temperature can be displayed in U.S. or Metric by
selecting the US/M customer programmable feature.
Refer to the ªOverhead Console-Customer Program-
mable Featuresº in Section 3 of this manual.
The left knob controls the blower fan. Within the AUTO
setting on this control, you can select a HI volume of air
from the blower or a LO volume. Once the system is set
up for your comfort level, it is not necessary to change
the setting. You will experience the greatest efficiency by
simply allowing the system to function automatically.Manual Operation
However, this system does offer a full complement of
manual override features. There is a manual blower
range used when the AUTO setting is not desired. The
left control can be set to any fixed blower speed by
rotating the knob from LO to HI on the upper portion of
the dial.
The operator can override the AUTO mode setting and
select the direction of the air by rotating the right mode
knob to one of the following positions.
²Defrost
Air is directed to the windshield through the
outlets at the base of the windshield.
²Defrost/Floor
Air flows through the front and rear floor outlets
and the outlets at the base of the windshield.
168 UNDERSTANDING YOUR INSTRUMENT PANEL

²Floor
Air flows through the floor outlets located under
the instrument panel and into the rear seating
area through vents under the front seats.
²Bi-Level
Air flows both through the outlets located in the
instrument panel and those located on the floor.
²Panel
Air flows through the outlets located in the in-
strument panel.
²OFF
This position turns off the entire system.
Depress the A/C button to turn on and off the air
conditioning during manual operation only. Conditioned
outside air is then directed through the outlets selected
on the mode control dial.When the outside air contains smoke, odors, high humid-
ity, or if rapid cooling is desired you may wish to
recirculate interior air by pressing the ªRecirculateº icon
button. The recirculation mode should only be used
temporarily. The light on the A/C and ªRecirculateº icon
buttons will illuminate when these buttons are selected.
You may use these features separately or with one
another. Push in on the buttons a second time to change
the functions.
NOTE:If the interior of the windows begins to fog,
press the ªRecirculateº icon button to return to outside
air. Some temp./humidity conditions will cause captured
interior air to condense on windows and hamper visibil-
ity. For this reason, the system will not allow ªRecircu-
lateº to be selected while in the defrost or defrost/floor
modes.
To provide you with maximum comfort in the automatic
mode, during cold start-ups the blower fan will remain
UNDERSTANDING YOUR INSTRUMENT PANEL 169
4

Always load a trailer with 60% of the cargo weight in the
front of the trailer. This places approximately 10% to 15%
of the GTW on the tow hitch of your vehicle. This portion
of the GTW becomes the tongue weight.
Trailer sway control and equalizing hitch are required for
tongue weights above 350 lbs (159 kg)., i.e., trailer
weights heavier than 3,500 lbs (1 587 kg).
Cooling System TipsÐTrailer Towing
To reduce potential for engine and transmission over-
heating in high ambient conditions, take the following
actions:
²City Traffic
When stopped, put transmission in N (Neutral) and
increase engine idle speed.
²Highway Driving
Reduce speed.
²Air Conditioning
Turn off temporarily.
To reduce the potential for transmission overheating,
turn the ªOverdriveº off when pulling any trailer or shift
the transmission to Drive position 2 on more severe
grades. Move the shift lever to the next lower position to
eliminate excessive transmission shifting. This action will
also reduce the possibility of transmission overheating
and provide better engine braking.
STARTING AND OPERATING 229
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IF YOUR ENGINE OVERHEATS
In any of the following situations, you can reduce the
potential for overheating by taking the appropriate ac-
tion.
²On the highways Ð Slow down.
²In city traffic Ð While stopped, put transmission in N
(Neutral), but do not increase engine idle speed.
NOTE:There are steps that you can take to slow down
an impending overheat condition. If your air conditioner
is on, turn it off. The air conditioning system adds heat to
the engine cooling system and turning off the A/C
removes this heat. You can also turn the Temperature
Control to maximum heat, the Mode Control to floor, and
the Fan Control to High. This allows the heater core to act
as a supplement to the radiator and aids in removing heat
from the engine cooling system.
CAUTION!
Driving with a hot cooling system could damage
your vehicle. If the temperature gauge reads ªHº,
pull over and stop the vehicle. Idle the vehicle with
the air conditioner turned off until the pointer drops
back into the normal range. If the pointer remains on
the ªHº, and you hear continuous chimes, turn the
engine off immediately, and call for service.
WHAT TO DO IN EMERGENCIES 237
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