cooling SUBARU BRZ 2023 Owners Manual

Climate Control4
Climate Control
4-1. Ventilator Control................................................198
Center Ventilators.........................................................198
Side Ventilators ............................................................198
4-2. Climate Control Panel.........................................198
4-3. Automatic Climate Control Operation...............200
Sensors .........................................................................200
4-4. Manual Climate Control ......................................201
Airflow Mode Selection ................................................201
Temperature Control ....................................................202
Fan Speed Control........................................................202
Air Conditioner Control................................................202
Air Inlet Selection .........................................................203
To Turn Off the Climate Control System ....................203
4-5. Defrosting ............................................................203 4-6. Operating Tips for Heater and Air

Conditioner ......... ....................................... ........204
Cleaning Ventilator Grille ............................................ 204
Efficient Cooling after Parking in Direct Sunlight .... 204
Lubrication Oil Circulation in the Refrigerant 
Circuit ......................................................................... 204
Checking Air Conditioning System before Summer Season ........................................................................ 204
Cooling and Dehumidifying in High Humidity and 
Low Temperature Weather Condition...................... 205
Air Conditioner Compressor Shut-Off When 
Engine Is Heavily Loaded ......................................... 205
Refrigerant for Your Climate Control System ........... 205
4-7. Air Filtration System ...........................................205
Replacing the Cabin Air Filter .................................... 206
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Ventilator Control
1984-1. Ventilator Control■Center Ventilators1) Open
2) CloseMove the tab to adjust the flow direction.
To open the ventilator, turn the center
grille open/close wheel upward to the “ ”
position.
To close it, turn th e wheel downward to
the “ ” position.
■ Side Ventilators1) Open
2) CloseTo adjust the flow direction, move the tab.
4-2. Climate Control Panel
21
21
403482
2
1
403483
WARNING
The cooling function operates
only when the engine is running. Do not leave children or adults
who would normally require the
support of others alone in your
vehicle. Pets should not be left
alone either. On hot, sunny days,
temperatures in a closed vehicle
could quickly become high
enough to cause severe or
possibly fatal injuries to people
or animals.
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Automatic Climate Control Operation
2004-3. Automatic Climate Control OperationWhen this mode is selected, the fan
speed, airflow mode, air-inlet control, and
air conditioner operation are automatically
controlled. To activate this mode, perform
the following.
1. Press the AUTO button. The FULL
AUTO mode is selected and the “FULL
AUTO” indicator light on the display illumi-
nates.
2. Set the preferred temperature using
the temperature control dial.NOTE Operate the automatic climate
control system when the engine is
running.
 Even when cooling is not necessary,
the air conditioner will automatically
turn on if the temperature is set much
lower than the cu rrent outlet air
temperature. Even in this case, the “A/
C” indicator light on the control panel
illuminates
 The air conditioner may not operate
in the following cases: - When the cabin temperature is
low
- When the ambient temperature
decreases close to 32°F (0°C) 
The controllable temperature range
may vary depending on the regional
specifications of the vehicle.
 If you operate any of the buttons on
the control panel other than the ON/
OFF button, rear window defogger
button, SYNC button and temperature
control dial(s) during FULL AUTO
mode operation, the “FULL” indicator
light on the control panel will turn off
and the “AUTO” indicator light will
remain illuminated. You can then
manually control the system as desired
using the button you operated. To
change the system back to the FULL
AUTO mode, press the AUTO button.
To turn off the climate control system,
press the ON/OFF button. Then the air
inlet selection will be set to the following.
 When the air inlet selection is set to
auto mode: Outside air circulation
 When the air inlet selection is set to
manual mode: No change
When the ignition switch is changed to the
“OFF” or “ACC” position from “ON”, the air
inlet mode will automatically change to the
outside air mode regardless of whether it
is the auto mode or manual mode.
■ Sensors1) Interior air temperature sensor
2) Solar sensorThe automatic climate control system
employs several sensors. These sensors
are delicate. If they are treated incorrectly
1
2
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Manual Climate Control
202Heat: Foot outlets, both side outlets of the
instrument panel and some through wind-
shield defroster outlets (A small amount of
air flows to the windshield and both side
windows to prevent fogging.) Heat-def: Windshield defroster outlets,

foot outlets and both side outlets of the
instrument panel
■ Temperature ControlTurn the temperature control dial to set
the preferred interior temperature.NOTEThe controllable temperature range
may vary depending on the regional
specifications of the vehicle.
▼ MAX A/C mode
For quicker cooling, press the MAX A/C
button.
When the MAX A/C mode is on, the
following settings will be changed auto-
matically.
 The air conditioner will turn on.
 The temperature will be set on the
lowest.
 The fan speed will be set on the
maximum speed.
 The air inlet will be set to the recircula-
tion mode.
 The airflow mode setting will be set to
the ventilation mode.
To turn off MAX A/C mode and return the
previous setting, press the MAX A/C
button again. ▼
SYNC mode
When the SYNC mode is turned on, both
the driver’s and front passenger’s side
temperatures are synchronized using the
driver’s side temperature control dial.
Press the SYNC button to turn on the
SYNC mode. The SYNC button indicator
will illuminate.
Press the SYNC button again or turn the
front passenger’s side temperature
control dial to cancel the SYNC mode.
The SYNC button indicator will not illumi-
nate. In this case, temperature control on
the driver’s side and front passenger’s
side is separated.
The temperature will be controlled individ-
ually using the driver’s and front
passenger’s temperature control dials.
■ Fan Speed ControlSelect the preferred fan speed by turning
the fan speed control dial.■ Air Conditioner ControlThe air conditioner operates only when
the engine is running.
Press the air conditioner button while the
fan is in operation to turn on the air condi-
tioner. When the air conditioner is on, the
“A/C” indicator light illuminates.
403489403490
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Defrosting
203
Climate Control4
– CONTINUED –
To turn off the air conditioner, press the
button again. The indicator light will turn
off.NOTEFor efficient defogging or dehumidify-
ing in cold weather, turn on the air
conditioner. However, if the ambient
temperature decreases to approxi-
mately 32°F (0°C), the air conditioner
and dehumidification system may not
work properly.■ Air Inlet SelectionSelect the air inlet by pressing the air inlet
selection button.
 Recirculation:
When the indicator light on the air inlet
selection button illuminates, interior air is
recirculated inside the vehicle. Press the
air inlet selection button to the ON position
in the following cases.
- When driving on a dusty road
- When you want cooling perfor-
mance to increase (for example, in
particularly hot weather)
 Outside air circulation:
When the indicator light on the air inlet
selection button does not illuminate,
outside air is drawn into the passenger
compartment. Press the air inlet selection button to the OFF position in the following

cases.
- When the road is no longer dusty
- When the interior has cooled to a
comfortable temperature
NOTEWhen outside air circulation is
selected, the system may automati-
cally adjust the air inlet setting
depending on such factors as the tem-
perature setting, the temperature
inside the vehicle, or conditions out-
side the vehicle.■ To Turn Off the Climate
Control SystemTo turn off the clim ate control system,
press the ON/OFF button.
4-5. DefrostingSelect the “ ” or “ ” mode to defrost
or dehumidify the windshield and the side
door windows.NOTE When the “” or “” mode is
selected, the air conditioner operates
automatically regardless of the posi-
tion of the air conditioner button to
defrost the wi ndshield more quickly.
However, the indicator on the air condi-
tioner button may not illuminate. At the
same time, the air inlet selection is
automatically set to the outside air
circulation mode.
 After defrosting the windshield by
pressing the defroster button “ ”,
pressing the button again returns the
WARNING
Continued operation in the recircu-
lation mode may fog up the win-
dows. Switch to the outside air
circulation mode as soon as the
outside dusty condition clears.
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Operating Tips for Heater and Air Conditioner
204system to the setting that had been
selected before the defroster was acti-
vated.
4-6. Operating Tips for Heater and Air Conditioner■ Cleaning Ventilator Grille1) Front ventilator inlet grille
2) CondenserAlways keep the front ventilator inlet grille
free of snow, leaves, or other obstructions
to ensure efficient heating and defrosting.
Since the condenser is located in front of
the radiator, this area should be kept
clean because cooling performance is
impaired by any accu mulation of insects
and leaves on the condenser.
■ Efficient Cooling after
Parking in Direct SunlightAfter parking in direct sunlight, drive with
the windows open for a few minutes to
allow outside air to circulate into the
heated interior. This results in quicker
cooling by the air conditioner. Keep the
windows closed during the operation of
the air conditioner for maximum cooling
efficiency.■ Lubrication Oil Circulation in
the Refrigerant CircuitOperate the air conditioner compressor at
a low engine speed (at idle or low driving
speeds) a few minutes each month during
the off-season to circulate its oil.■ Checking Air Conditioning
System before Summer
SeasonCheck the air conditioner unit for refrig-
erant leaks, hose conditions, and proper
operation each spring. Have the air condi-
tioning system checked by your SUBARU
dealer.
2
1
403492
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Air Filtration System
205
Climate Control4
– CONTINUED –
■Cooling and Dehumidifying
in High Humidity and Low
Te mperature Weather Condi -
tionUnder certain weather conditions (high
relative humidity, lo w temperatures, etc.)
a small amount of water vapor emission
from the air outlets may be noticed. This
condition is normal and does not indicate
any problem with the air conditioning
system.■ Air Conditioner Compressor
Shut-Off Whe n Engine Is
Heavily LoadedTo improve acceleration and gas mileage,
the air conditio ner compressor is
designed to temporarily shut off during air
conditioner operation whenever the accel-
erator is fully depressed such as during
rapid acceleration or when driving on a
steep upgrade.
■ Refrigerant for Your Climate
Control Syste m1) Air conditioner labelYour air conditioner uses ozone friendly
refrigerant R-1234yf (HFO-1234yf).
Before adding, changing or checking the
refrigerant, check the air conditioner label
in the location shown in the illustration to
confirm the type of refrigerant is used in
your vehicle.
Consult your SUBARU dealer for service.
Repairs needed as a result of using the
wrong refrigerant are not covered under
warranty.
4-7. Air Filtration SystemYour vehicle’s air conditioning system is
equipped with an air filtration system.
Replace the cabin air filter according to
the replacement schedule found in the
“Warranty and Maintenance Booklet”.
This schedule should be followed to main-
tain the filter’s dust collection ability.
Under extremely dusty conditions, the
filter should be replaced more frequently.
Have your filter checked or replaced by
your SUBARU dealer. For replacement,
use only a genuine SUBARU air filter kit.NOTEThe filter can influence the air condi-
tioning, heating and defroster perfor-
mance if not properly maintained.
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403493
CAUTION
Contact your SUBARU dealer if the
following occurs, even if it is not yet
time to change the filter. Reduction of the airflow through
the vents. Windshield gets easily fogged or
misted.
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Jump Starting
316■TPMS Screen (If Equipped)This screen displays ea ch tire pressure.
Refer to "Combination Meter Display
(Color TFT)" P151.
9-4. Jump Starting■ Battery Precautions
When your vehicle does not start due to a
run down (discharged) battery, the vehicle
may be jump started by connecting your
battery to another battery (called the
booster battery) with jumper cables.
702781
WARNING
 Battery fluid is SULFURIC ACID.
Do not let it come in contact with
the eyes, skin, clothing or the
vehicle.
If battery fluid gets on you, thor-
oughly flush the exposed area
with water immedi ately. Get med-
ical help if the fluid has entered
your eyes.If battery fluid is accidentally
swallowed, imme diately drink a
large amount of milk or water,
and obtain immediate medical
help.Keep everyone including chil-
dren away from the battery.
 The gas generated by a battery
explodes if a flame or spark is
brought near it. Do not smoke or
light a match while jump starting. Never attempt jump starting if the
discharged battery is frozen. It
could cause the battery to burst
or explode.
 Whenever working on or around a
battery, always wear suitable eye
protectors, and remove metal
objects such as rings, bands or
other metal jewelry. Be sure the jumper cables and
clamps on them do not have
loose or missing insulation. Do not jump start unless cables in
suitable condition are available. A running engine can be
dangerous. Keep your fingers,
hands, clothing, hair and tools
away from the cooling fan, belts
and any other moving engine
parts. Removing rings, watches
and ties is advisable. Jump starting is dangerous if it is
done incorrectly. If you are
unsure about the proper proce-
dure for jump starting, consult a
competent mechanic.
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Engine Overheating
319
In Case of Emergency9
– CONTINUED –
9-5. Engine Overheating■If Steam Is Coming from the
Engine CompartmentTurn off the engine and get everyone
away from the vehicle until it cools down.
■ If No Steam Is Coming from
the Engine Compartment1. Keep the engine running at idling
speed.
2. Open the hood to ventilate the engine
compartment. Refer to "Engine Hood"
 P343.
Confirm that the cooling fan is turning. If
the fan is not turning, immediately turn off
the engine and contact your authorized
dealer for repair.
3. After the engine coolant temperature
has dropped, turn off the engine.
If the temperature gauge stays in the over-
heated zone, turn off the engine.
4. After the engine has fully cooled down,
check the coolant level in the reserve
tank.
If the coolant level is below the “LOW”
mark, add coolant up to the “FULL” mark.NOTEFor details about how to check the
coolant level or how to add coolant,
refer to "Eng ine Coolant" P349.
5. If there is no coolant in the reserve
tank, add coolant to the reserve tank.
Then remove the radiator cap and fill the
radiator with coolant.
If you remove the radiator cap from a hot
radiator, first wrap a thick cloth around the radiator cap, then turn the cap

counterclockwise slowly without pressing
down until it stops. Release the pressure
from the radiator. After the pressure has
been fully released, remove the cap by
pressing down and turning it.
WARNING
Never remove the radiator cap until
the engine has been shut off and
has fully cooled down. When the
engine is hot, the coolant is under
pressure. Removing the cap while
the engine is still hot could release
a spray of boiling hot coolant,
which could burn you very seri-
ously.
CAUTION
If the engine overheats, the engine
speed or the vehicle speed may be
reduced. Stop the vehicle in a safe
place immediately.
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Maintenance and Service11
Maintenance and Service
11-1. Maintenance Schedule .....................................339
11-2. Maintenance Precautions.................................339
Before Checking or Servicing in the Engine
Compartment ..............................................................340
When Checking or Servicing in the Engine Compartment ..............................................................340
When Checking or Servicing in the Engine Compartment While the Engine Is Running ............341
11-3. Maintenance Tips ..............................................341
Removing and Reinstalling Clips................................341
11-4. Engine Hood ......................................................343
11-5. Engine Compartment Overview.......................345
11-6. Engine Oil ..........................................................346
Engine Oil Consumption..............................................346
Checking the Oil Level .................................................346
Changing the Oil and Oil Filter ....................................347
Recommended Grade and Viscosity ..........................347
Synthetic Oil..................................................................348
11-7. Cooling System .................................................348
Cooling Fan, Hose and Connections ..........................348
Engine Coolant .............................................................349
11-8. Air Cleaner Element ..........................................350
Replacing the Air Cleaner Element .............................350
11-9. Spark Plugs .......................................................352
Recommended Spark Plugs ........................................352
11-10. Drive Belt .........................................................352
11-11. Automatic Transmission Fluid ......................352
Recommended Grade and Viscosity ..........................352
11-12. Differential Gear Oil ........................................353
Recommended Grade and Viscosity ..........................353
11-13. Manual Transmission Oil ...............................353
Recommended Grade and Viscosity ..........................353
11-14. Brake Fluid ......................................................353
Checking the Fluid Level ............................................ 353
Recommended Brake Fluid ........................................ 354
11-15. Clutch Fluid (MT models) ...............................354
Checking the Fluid Level ............................................ 354
Recommended Clutch Fluid ....................................... 355
11-16. Brake Booster .................................................355
11-17. Brake Pedal .....................................................356
11-18. Clutch Pedal (MT models) ..............................356
11-19. Replacement of Brake Pad and Lining..........356
Breaking-in of New Brake Pads and Linings ............ 357
11-20. Parking Brake Stroke ......................................357
11-21. Tires and Wheels ............................................358
Types of Tires .............................................................. 358
Tire Pressure Monito ring System (TPMS) 
(If Equipped)............................................................... 358
Tire Inspection ............................................................. 360
Tire Pressures and Wear............................................. 361
Wheel Balance ............................................................. 363
Wear Indicators ............................................................ 363
Rotational Direction of Tires....................................... 364
Tire Rotation................................................................. 364
Tire Replacement ...... ............................. ...................... 365
Wheel Replacement ..................................................... 365
11-22. Alloy Wheels ....................................................366
11-23. Windshield Washer Fluid ...............................366
11-24. Replacement of Wiper Blades........................367
Windshield Wiper Blade Assembly ............................ 368
Windshield Wiper Blade Rubber ................................ 369
11-25. Battery ..............................................................370
11-26. Fuses ................................................................371
11-27. Installation of Acce ssories ............................373
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