2023 JEEP WRANGLER air conditioning

GETTING TO KNOW YOUR VEHICLE55
MAX A/C Button
Press and release the MAX A/C button on the
touchscreen to change the current setting to
the coldest output of air. The MAX A/C indicator
illuminates when MAX A/C is on. Pressing the
button again will cause the MAX A/C operation to exit.
NOTE:The MAX A/C button is only available on the touchscreen.
MAX A/C sets the control for maximum cooling
performance. The button illuminates when MAX A/C is on.
In MAX A/C, the blower level and mode position can be
adjusted to desired user settings. Pressing other settings
will cause the MAX A/C to turn off.
A/C Button
Press and release this button on the
touchscreen, or push the button on the
faceplate to change the current setting. The
A/C indicator illuminates when A/C is on.
The A/C button allows the operator to manually activate or
deactivate the A/C system. When the A/C system is turned
on, cool dehumidified air will flow through the outlets into
the cabin.
Recirculation Button
Press and release this button on the
touchscreen, or push the button on the
faceplate, to change the system between
recirculation mode and outside air mode. The
Recirculation indicator and the A/C indicator illuminate
when the Recirculation button is pressed. Recirculation
can be used when outside conditions, such as smoke,
odors, dust, or high humidity are present. Recirculation can be used in all modes. Recirculation may be
unavailable (button on the touchscreen greyed out) if
conditions exist that could create fogging on the inside of
the windshield. The A/C can be deselected manually
without disturbing the mode control selection. Continuous
use of the Recirculation mode may make the inside air
stuffy and window fogging may occur. Extended use of this
mode is not recommended. Recirculation mode may
automatically adjust to optimize customer experience for
warming, cooling, dehumidification, etc.
In cold weather, use of Recirculation mode may lead to
excessive window fogging.
AUTO Button
Set your desired temperature and press and
release the AUTO button on the touchscreen, or
push the button on the faceplate. AUTO will
achieve and maintain your desired
temperature by automatically adjusting the blower speed
and air distribution. Air Conditioning (A/C) may be active
during AUTO operation to improve performance. AUTO
mode is highly recommended for efficiency. You can press
and release this button on the touchscreen, or push the
button on the faceplate, to turn AUTO on. The AUTO
indicator illuminates when AUTO is on. Toggling this
function will cause the system to switch between manual
mode and automatic mode
Úpage 59.
Front Defrost Button
Press and release this button on the
touchscreen, or push and release the button on
the faceplate, to change the current airflow
setting to Defrost mode. The Front Defrost
indicator illuminates when Front Defrost is on. Air comes
from the windshield and side window demist outlets. When the defrost button is selected, the blower level may
increase. Use Defrost mode with maximum temperature
settings for best windshield and side window defrosting
and defogging. When toggling the front defrost mode
button, the climate system returns to the previous setting.
Rear Defrost Button
Press and release the Rear Defrost button on
the touchscreen, or push and release the
button on the faceplate, to turn on the rear
window defroster and the heated outside
mirrors (if equipped). The Rear Defrost indicator
illuminates when the rear window defroster is on. The rear
window defroster automatically turns off after 10 minutes.
CAUTION!
Failure to follow these cautions can cause damage to
the heating elements:
 Use care when washing the inside of the rear
window. Do not use abrasive window cleaners on the
interior surface of the window. Use a soft cloth and a
mild washing solution, wiping parallel to the heating
elements. Labels can be peeled off after soaking
with warm water.
 Do not use scrapers, sharp instruments, or abrasive
window cleaners on the interior surface of the
window.
 Keep all objects a safe distance from the window.
2

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GETTING TO KNOW YOUR VEHICLE57
MANUAL CLIMATE CONTROL
D
ESCRIPTIONS AND FUNCTIONS

Uconnect 4 With 7-inch Display Manual Climate Controls
Uconnect 3 With 5-inch Display Manual Climate Controls

MAX A/C Setting — If Equipped
Set the temperature control knob to the MAX
A/C setting to change the current setting to the
coldest output of air. Moving the temperature
control knob away from the MAX A/C setting
causes the MAX A/C operation to exit.
A/C Button
Push the A/C button to engage the Air
Conditioning (A/C). The A/C indicator
illuminates when A/C is on.
NOTE:
 For Manual Climate Controls, if the system is in Mix,
Floor or Defrost Mode, the A/C can be turned off, but
the A/C system shall remain active to prevent fogging
of the windows.
 If fog or mist appears on the windshield or side glass,
select Defrost mode, and increase blower speed if
needed.
 If your air conditioning performance seems lower than
expected, check the front of the A/C condenser
(located in front of the radiator), for an accumulation of
dirt or insects. Clean with a gentle water spray from the
front of the radiator and through the condenser.
Recirculation Button
Push the recirculation button on the faceplate
to change the system between recirculation
mode and outside air mode. The Recirculation
indicator and the A/C indicator (if equipped)
illuminate when the Recirculation button is pressed.
Recirculation can be used when outside conditions such
as smoke, odors, dust, or high humidity are present. Recirculation can be used in all modes except for Defrost.
Recirculation may be unavailable if conditions exist that
could create fogging on the inside of the windshield. The
A/C can be deselected manually without disturbing the
mode control selection. Continuous use of the
Recirculation mode may make the inside air stuffy and
window fogging may occur. Extended use of this mode is
not recommended.
On systems with Manual Climate Controls (if equipped),
the Recirculation mode is not allowed in Defrost mode to
improve window clearing operation. Recirculation is
disabled automatically if this mode is selected. Attempting
to use Recirculation while in this mode causes the LED in
the control button to blink and then turns off.
Front Defrost Setting
Turn the Mode Control knob to the Front
Defrost mode setting. Air comes from the
windshield and side window demist outlets.
When the Defrost button is selected, the blower
level may increase. Use Defrost mode with maximum
temperature settings for best windshield and side window
defrosting and defogging.
Rear Defrost Button
Push and release the Rear Defrost Control
button to turn on the rear window defroster and
the heated outside mirrors (if equipped). The
Rear Defrost indicator illuminates when the
rear window defroster is on. The rear window defroster
automatically turns off after 10 minutes.
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118GETTING TO KNOW YOUR INSTRUMENT PANEL
Electric Power Steering (EPS) Fault
Warning Light
This warning light will turn on when there's a
fault with the EPS system Úpage 146.
Electronic Throttle Control (ETC) Warning
Light
This warning light will illuminate to indicate a
problem with the ETC system. If a problem is
detected while the vehicle is running, the light
will either stay on or flash depending on the
nature of the problem. Cycle the ignition when the vehicle
is safely and completely stopped and the transmission is
placed in the PARK (P) position. The light should turn off.
If the light remains on with the vehicle running, your
vehicle will usually be drivable; however, see an
authorized dealer for service as soon as possible.
NOTE:This light may turn on if the accelerator and brake pedals
are pressed at the same time.
If the light continues to flash when the vehicle is running,
immediate service is required and you may experience
reduced performance, an elevated/rough idle, or engine
stall and your vehicle may require towing. The light will come on when the ignition is placed in the ON/RUN or
ACC/ON/RUN position and remain on briefly as a bulb
check. If the light does not come on during starting, have
the system checked by an authorized dealer.
Engine Coolant Temperature Warning
Light
This warning light warns of an overheated
engine condition. If the engine coolant
temperature is too high, this indicator will
illuminate and a single chime will sound. If the
temperature reaches the upper limit, a continuous chime
will sound for four minutes or until the engine is able to
cool, whichever comes first.
If the light turns on while driving, safely pull over and stop
the vehicle. If the Air Conditioning (A/C) system is on, turn
it off. Also, shift the transmission into NEUTRAL (N) and
idle the vehicle. If the temperature reading does not return
to normal, turn the engine off immediately and call for
service
Úpage 300.
Hood Open Warning Light
This indicator will illuminate when the hood is
ajar/open and not fully closed.
NOTE:If the vehicle is moving, there will also be a single chime.
Oil Pressure Warning Light
This warning light will illuminate, and a chime
will sound, to indicate low engine oil pressure.
If the light and chime turn on while driving,
safely stop the vehicle and turn off the engine as soon as possible. After the vehicle is safely stopped,
restart the engine and monitor the Oil Pressure Warning
Light. If the Oil Pressure Warning Light is still illuminated,
turn the engine OFF and contact an authorized dealer for
further assistance. Do not operate the vehicle until the
cause is corrected. If the light is no longer illuminated, the
engine can be operated but it is recommended to take the
vehicle to an authorized dealer as soon as possible.
Do not operate the vehicle until the cause is corrected.
This light does not indicate how much oil is in the engine.
The engine oil level must be checked under the hood.
Oil Temperature Warning Light
This warning light will illuminate to indicate the
engine oil temperature is high. If the light turns
on while driving, stop the vehicle and shut off
the engine as soon as possible. Wait for oil
temperature to return to normal levels.
Seat Belt Reminder Warning Light
This warning light indicates when the driver or
passenger seat belt is unbuckled. When the
ignition is first placed in the ON/RUN or ACC/
ON/RUN position and if the driver’s seat belt is
unbuckled, a chime will sound and the light will turn on.
When driving, if the driver or front passenger seat belt
remains unbuckled, the Seat Belt Reminder Light will flash
or remain on continuously and a chime will sound
Úpage 261.
WARNING!
Continued operation with reduced assist could pose a
safety risk to yourself and others. Service should be
obtained as soon as possible.

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132STARTING AND OPERATING
STOPPING THE ENGINE
After full load operation, idle the engine for a few minutes before shutting it down. This idle period will allow the lubricating oil and coolant to carry excess heat away from the
turbocharger.
NOTE:Refer to the following chart for proper engine shutdown.
NOTE:Under certain conditions the engine fan will run after the
engine is turned off. These conditions are under high load
and high temperature conditions.
COOLING SYSTEM TIPS — AUTOMATIC
T
RANSMISSION
To reduce the potential for engine and transmission
overheating in high ambient temperature conditions, take
the following actions:
 City Driving — When stopped, shift the transmission
into NEUTRAL (N) and increase engine idle speed.
 Highway Driving — Reduce your speed. 
Up Steep Hills — Select a lower transmission gear.
 Air Conditioning — Turn it off temporarily.
NOTE:If the coolant temperature is too high, the A/C will auto -
matically turn off.
Do Not Operate The Engine With Low Oil
Pressure
If the Oil Pressure Warning Light turns on while driving,
stop the vehicle and shut down the engine as soon as
possible. A chime will sound when the light turns on. After
the vehicle is safely stopped, restart the engine and
monitor the Oil Pressure Warning Light. If the Oil Pressure
Warning Light is still illuminated, turn the engine OFF and contact an authorized dealer for further assistance. If the
lamp is no longer illuminated, the engine can be operated
but it is recommended to take the vehicle to an authorized
dealer as soon as possible.
NOTE:Do not operate the vehicle until the cause is corrected.
This light does not show how much oil is in the engine. The
engine oil level must be checked under the hood.
Driving Condition Load Turbocharger Temperature Idle Time (min.) Before Engine Shutdown
Stop and Go EmptyCoolNone
Stop and Go Medium 0.5
Highway Speeds MediumWarm 1.0
City Traffic Maximum GCWR 1.5
Highway Speeds Maximum GCWR 2.0
Uphill Grade Maximum GCWR Hot2.5
CAUTION!
If oil pressure falls to less than normal readings, shut
the engine off immediately. Failure to do so could result
in immediate and severe engine damage.

23_JL_OM_EN_USC_t.book Page 132

324SERVICING AND MAINTENANCE
reacts with engine exhaust in the presence of a catalyst to
convert smog-forming Nitrogen Oxides (NOx) into
harmless nitrogen and water vapor.
For further information
Úpage 374.
ACCESSORY DRIVE BELT INSPECTION
When inspecting accessory drive belts, small cracks that
run across the ribbed surface of the belt, from rib to rib,
are considered normal. These are not a reason to replace
a belt. However, cracks running along a rib (not across) are
not normal. Any belt with cracks running along a rib must
be replaced. Also have the belt replaced if it has excessive
wear, frayed cords, or severe glazing.

Accessory Belt (Serpentine Belt)

Conditions that would require replacement:
Rib chunking (one or more ribs has separated from belt
body)
 Rib or belt wear
 Longitudinal belt cracking (cracks between two ribs)
 Belt slips
 Groove jumping (belt does not maintain correct posi -
tion on pulley)
 Belt broken
 Noise (objectionable squeal, squeak, or rumble is
heard or felt while drive belt is in operation)
NOTE:Identify and correct problem before new belt is installed.
Some conditions can be caused by a faulty component
such as a belt pulley. Belt pulleys should be carefully
inspected for damage and proper alignment.
Belt replacement on some models requires the use of
special tools, we recommend having your vehicle serviced
at an authorized dealer.
AIR CONDITIONER MAINTENANCE
For best possible performance, your air conditioner should
be checked and serviced by an authorized dealer at the
start of each warm season. This service should include
cleaning of the condenser fins and a performance test.
Drive belt tension should also be checked at this time.
WARNING!
Do not attempt to inspect an accessory drive belt
with the vehicle running.
 When working near the radiator cooling fan, discon -
nect the fan motor lead. The fan is temperature
controlled and can start at any time regardless of
ignition mode. You could be injured by the moving
fan blades.
 You can be badly injured working on or around a
motor vehicle. Only do service work for which you
have the knowledge and the proper equipment. If
you have any doubt about your ability to perform a
service job, take your vehicle to a competent
mechanic.WARNING!
Use only refrigerants and compressor lubricants
approved by the manufacturer for your air condi -
tioning system. Some unapproved refrigerants are
flammable and can explode, injuring you. Other
unapproved refrigerants or lubricants can cause the
system to fail, requiring costly repairs. Refer to
Warranty Information Book, located in your owner’s
information kit, for further warranty information.
 The air conditioning system contains refrigerant
under high pressure. To avoid risk of personal injury
or damage to the system, adding refrigerant or any
repair requiring lines to be disconnected should be
done by an experienced technician.
CAUTION!
Do not use chemical flushes in your air conditioning
system as the chemicals can damage your air
conditioning components. Such damage is not covered
by the New Vehicle Limited Warranty.

23_JL_OM_EN_USC_t.book Page 324

SERVICING AND MAINTENANCE325
Refrigerant Recovery And Recycling —
R–1234yf
R–1234yf Air Conditioning Refrigerant is a Hydrofluo -
roolefin (HFO) that is endorsed by the Environmental
Protection Agency and is an ozone-friendly substance with
a low global-warming potential. The manufacturer
recommends that air conditioning service be performed by
an authorized dealer using recovery and recycling
equipment.
NOTE:Use only the manufacturer approved A/C system PAG
compressor oil, and refrigerants.
Cabin Air Filter
The cabin air filter is located in the fresh air inlet behind
the glove compartment. Perform the following procedure
to replace the filter:

1. Open the glove compartment and remove all contents.

2. Push up on the glove compartment travel stop and lower the door.

Glove Compartment Travel Stop

3. Pivot the glove compartment downward.
4. Disengage the two retaining tabs that secure the air filter access door to the HVAC housing.

Air Filter Retaining Tabs

5. Remove the air filter from the HVAC air inlet housing. Pull the filter elements out pinching them to the right
for clearance.

Air Filter

6. Install the cabin air filter with the air filter position indicators pointing in the same direction as removal.
7. Close cabin air filter access door and secure retaining tabs.WARNING!
Do not remove the cabin air filter while the vehicle is
running, or while the ignition is in the ACC or ON/RUN
mode. With the cabin air filter removed and the blower
operating, the blower can contact hands and may
propel dirt and debris into your eyes, resulting in
personal injury.
CAUTION!
The cabin air filter is identified with an arrow to indicate
airflow direction through the filter. Failure to properly
install the filter will result in the need to replace it more
often.
8

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SERVICING AND MAINTENANCE331
(Continued)
With the engine OFF and cold, the level of the engine
coolant should be within the OK range between the ADD
and FULL range on the dipstick.

1. Remove the cap with level dipstick from the engine
coolant bottle.

2. Clean off the coolant from the dipstick.
3. Rest the cap on the opening of the coolant bottle without tightening the cap.
4. Remove the cap with dipstick and check the coolant level on the dipstick.
The radiator normally remains completely full, so there is
no need to remove the radiator/coolant pressure cap
unless checking for engine coolant freeze point or
replacing coolant. Advise your service attendant of this. As
long as the engine operating temperature is satisfactory,
the coolant bottle need only be checked once a month.
When additional engine coolant is needed to maintain the
proper level, only OAT coolant that meets the
requirements of the manufacturer Material Standard
MS.90032 should be added to the coolant bottle. Do not
overfill.
Cooling System Notes
NOTE:When the vehicle is stopped after a few miles/kilometers
of operation, you may observe vapor coming from the front
of the engine compartment. This is normally a result of
moisture from rain, snow, or high humidity accumulating
on the radiator and being vaporized when the thermostat
opens, allowing hot engine coolant (antifreeze) to enter
the radiator. If an examination of your engine compartment shows no
evidence of radiator or hose leaks, the vehicle may be
safely driven. The vapor will soon dissipate.

Do not overfill the coolant expansion bottle.
 Check the coolant freeze point in the radiator and in
the coolant expansion bottle. If engine coolant needs
to be added, the contents of the coolant expansion
bottle must also be protected against freezing.
 If frequent engine coolant additions are required, the
cooling system should be pressure tested for leaks.
 Maintain engine coolant concentration at a minimum
of 50% OAT coolant (conforming to MS.90032) and
distilled water for proper corrosion protection of your
engine which contains aluminum components.
 Make sure that the coolant expansion bottle overflow
hoses are not kinked or obstructed.
 Keep the front of the radiator clean. If your vehicle is
equipped with air conditioning, keep the front of the
condenser clean.
 Do not change the thermostat for Summer or Winter
operation. If replacement is ever necessary, install
ONLY the correct type thermostat. Other designs may
result in unsatisfactory engine cooling performance,
poor gas mileage, and increased emissions.BRAKE SYSTEM
In order to ensure brake system performance, all brake
system components should be inspected periodically. For
the proper maintenance intervals
Úpage 307.
Fluid Level Check — Brake Master Cylinder
The fluid level of the master cylinder should be checked
whenever the vehicle is serviced, or immediately if the
Brake System Warning Light is on. If necessary, add fluid
to bring level within the designated marks on the side of
the reservoir of the brake master cylinder. Be sure to clean
the top of the master cylinder area before removing cap.
With disc brakes, fluid level can be expected to fall as the
brake pads wear. Brake fluid level should be checked
when pads are replaced. If the brake fluid is abnormally
low, check the system for leaks
Úpage 376.
WARNING!
Riding the brakes can lead to brake failure and possibly
a collision. Driving with your foot resting or riding on the
brake pedal can result in abnormally high brake
temperatures, excessive lining wear, and possible brake
damage. You would not have your full braking capacity
in an emergency.
WARNING!
Use only the manufacturer recommended brake fluid Úpage 376. Using the wrong type of brake fluid can
severely damage your brake system and/or impair its
performance. The proper type of brake fluid for your
vehicle is also identified on the original factory
installed hydraulic master cylinder reservoir.
8

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SERVICING AND MAINTENANCE337
F03 –5 Amp TanIntelligent Battery Sensor (IBS)
F04 –20 Amp Yellow Fuel Pump MTR/FPCM
25 Amp Clear Fuel Pmp (6.4) *
F05 –5 Amp TanSecurity Gateway
F06 ––Spare *
F07 –15 Amp BlueLTR Coolant Pump *
F08 –15 Amp BlueTCM-8HP CYGNUS
F09 ––Spare *
F10 –15 Amp BlueKIN / RF HUB / ESCL
F11 –10 Amp RedUCI Port (USB & AUX)
F12 –25 Amp ClearHIFI Amplifier
F13 ––Spare *
F14 ––Spare *
F15 –15 Amp BlueIPC / Switch Bank-HD Elec
F16 ––Spare *
F17 ––Spare *
F18 –10 Amp RedAir Conditioning Clutch (AC CLUTCH)
F19 ––Spare *
F20 30 Amp Pink –Central Body Controller (CBC) 1-INTERIOR LIGHTS
F21 –20 Amp Yellow REAR WIPER
F22 –10 Amp RedEngine Control Module (ECM)/Powertrain Control Module (PCM)/Motor
Generator Unit (MGU) WAKE UP/Power Pack Unit (PPU) WAKE UP
F23 –10 Amp RedECM / PCM
F24 ––Spare *
Cavity Cartridge Fuse Micro Fuse Description

* If Equipped
8

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