2023 TOYOTA TUNDRA cooling

3385-1. Using the air conditioning system
Manual air conditioning system*1
■Adjusting the temperature setting
To adjust the temperature set-
ting, turn the temperature con-
trol dial clockwise (warm) or
counterclockwise (cool).
If is not pressed, the sys-
tem will blow ambient tempera-
ture air or heated air.
For quick cooling, turn the tem-
perature control dial to the “MAX
A/C” position.
The air conditioning will automatically turn on and the air int ake selector
will be set to recirculated air mode.
1: If equipped
Air conditioning controls

3775-4. Other interior features
5
Interior features
■Maximum available capacity of the power outlet
●While the vehicl e is being driven
The maximum capacity of the power outlet is always 120 V AC/
100 W.
● When the vehicle is stationary
The maximum capacity of the power outlet varies depending on
the following conditions:
• The maximum capacity is 120 V AC/100 W when the following conditions applies:
Vehicles with an automatic transmission
The shift lever is moved to any positions other than P and N.
Vehicles with a manual transmission
The clutch pedal is depressed.
• The maximum capacity is 120 V AC/400 W when the followingconditions applies:
Vehicles with an automatic transmission
The shift lever is in P or N.
Vehicles with a manual transmission
The shift lever is in N and the clutch pedal is not depressed.
The maximum capacity of 400 W can only be restored by turning the
power outlet main switch off and then on again under condition
described above.
■ The power outlet can be used when
The engine is running.
■ The indicator light changes according to the maximum available capac-
ity as follows:
■ When the power outlet is in operation
The sound of the cooling fan may be heard from the front consol e box. This is
normal and does not indicate a malfunction. 120 V AC/400 W
120 V AC/100 W
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4246-3. Do-it-yourself maintenance
■Coolant selection
Only use “Toyota Super Long Life Coolant” or a similar high quality ethylene
glycol based non-silicate, non-amine, non-nitrite, and non-bora te coolant with
long-life hybrid organic acid technology.
U.S.A.:
“Toyota Super Long Life Coolant” is a mixture of 50% coolant and 50% deion-
ized water. (Minimum temperature: -31 F [-35 C])
Canada:
“Toyota Super Long Life Coolant” is a mixture of 55% coolant and 45% deion-
ized water. (Minimum temperature: -44 F [-42 C])
For more details about coolant, contact your Toyota dealer.
■ If the coolant level drops within a short time of replenishing
Visually check the radiator, hoses, engine coolant reservoir ca p, drain cock
and water pump.
If you cannot find a leak, have your Toyota dealer test the cap and check for
leaks in the cooling system.
WARNING
■ When the engine is hot
Do not remove the radiator cap and engine coolant reservoir cap . (P. 534)
The cooling system may be under pressure and may spray hot coolant if the
cap is removed, causing serious injuries, such as burns.
NOTICE
■ When adding coolant
Coolant is neither plain water nor straight antifreeze. The cor rect mixture of
water and antifreeze must be used to provide proper lubrication, corrosion
protection and cooling. Be sure to read the antifreeze or coolant label.
■ If you spill coolant
Be sure to wash it off with water to prevent it from damaging p arts or paint.

5337-2. Steps to take in an emergency
7
When trouble arises
WARNING
■Avoiding battery fires or explosions
Observe the following precautions to prevent accidentally ignit ing the flam-
mable gas that may be emitted from the battery:
● Make sure each jumper cable is connected to the correct terminal and that
it is not unintentionally in contact with any other than the in tended terminal.
● Do not allow the other end of the jumper cable connected to the “+” termi-
nal to come into contact with any other parts or metal surfaces in the area,
such as brackets or unpainted metal.
● Do not allow the + and - clamps of the jumper cables to come into contact
with each other.
● Do not smoke, use matches, cigarette lighters or allow open fla me near
the battery.
■ Battery precautions
The battery contains poisonous and corrosive acidic electrolyte, while
related parts contain lead and lead compounds. Observe the following pre-
cautions when handling the battery:
● When working with the battery, always wear safety glasses and take care
not to allow any battery fluids (acid) to come into contact with skin, clothing
or the vehicle body.
● Do not lean over the battery.
● In the event that battery fluid comes into contact with the skin or eyes,
immediately wash the affected area with water and seek medical attention.
Place a wet sponge or cloth over the affected area until medical attention
can be received.
● Always wash your hands after handling the battery support, terminals, and
other battery-related parts.
● Do not allow children near the battery.
■ To prevent damage to the vehicle
Do not pull- or push-start the vehicle as the three-way catalytic converter
may overheat and become a fire hazard.
NOTICE
■When handling jumper cables
When connecting the jumper cables, ensure that they do not beco me entan-
gled in the cooling fan or belt.

5347-2. Steps to take in an emergency
If your vehicle overheats
●The needle of the engine coolant temperature gauge ( P. 9 8 )
enters the red zone or a loss of engine power is experienced. ( For
example, the vehicle speed does not increase.)
● “High Engine Coolant Temperature” is shown on the multi-informa-
tion display. (if equipped)
● Steam comes out f rom under the hood.
Stop the vehicle in a safe place and turn off the air condition ing sys-
tem, and then stop the engine.
If you see steam:
Carefully lift the hood after the steam subsides.
If you do not see steam:
Carefully lift the hood.
After the engine has cooled
down sufficiently, inspect the
hoses and radiator core (radia-
tor) for any leaks. Radiator
Cooling fan
If a large amount of coolant leaks,
immediately contact your Toyota
dealer.
The coolant level is satisfactory
if it is between the “FULL” and
“LOW” lines on the reservoir.Reservoir
“FULL”
“LOW”
Radiator cap
The following may indicate that your vehicle is overheating:
Correction procedures
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4
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5357-2. Steps to take in an emergency
7
When trouble arises
Add coolant if necessary.
Water can be used in an emer-
gency if coolant is unavailable.
Start the engine to check that the radiator cooling fan operates and
to check for coolant leaks from the radiator or hoses.
If the fan is not operating:
Stop the engine immediately and contact your Toyota dealer.
If the fan is operating:
Have the vehicle inspected at the neare st Toyota dealer.
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WARNING
■When inspecting under the hood of your vehicle
Observe the following precautions.
Failure to do so may result in serious injury such as burns.
● If steam is seen coming from under the hood, do not open the ho od until
the steam has subsided. The engine compartment may be very hot.
● Keep hands and clothing away from the fans, etc., while the engine is run-
ning.
● Do not loosen the radiator cap and the coolant reservoir cap while the
engine and radiator are hot.
High temperature steam or coolant could spray out.
NOTICE
■When adding engine coolant
Add coolant slowly after the engine has cooled down sufficiently. Adding
cool coolant to a hot engine too quickly can cause damage to the engine.
■ To prevent damage to the cooling system
Observe the following precautions:
● Avoid contaminating the coolant with foreign matter (such as sa nd or dust,
etc.).
● Do not use any coolant additives.
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5478-1. Specifications
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Vehicle specifications
Cooling system
Capacity
2TR-FE
engine
Vehicles with an automatic transmission
9.1 qt. (8.6 L, 7.6 Imp.qt.)
Vehicles with a manual transmission
9.2 qt. (8.7 L, 7.7 Imp.qt.)
2GR-FKS
engine
Vehicles with an automatic transmission
11.1 qt. (10.5 L, 9.2 Imp.qt.)
Vehicles with a manual transmission
10.8 qt. (10.2 L, 9.0 Imp.qt.)
Coolant typeUse either of the following.
• “Toyota Super Long Life Coolant”
• Similar high-quality ethylene glycol-based
non-silicate, non-amine, non-nitrite, and
non-borate coolant with long-life hybrid
organic acid technology
Do not use plain water alone.
Ignition system
Spark plug
Make2TR-FE engine
DENSO FK20HR-A8
2GR-FKS engine
DENSO FK20HBR8
Gap0.031 in. (0.8 mm)
NOTICE
■ Iridium-tipped spark plugs
Use only iridium-tipped spark plugs. Do not adjust the spark pl ug gap.

602Alphabetical index
Child safety ................................ 53Airbag precautions .................. 39
Battery precautions ............... 533
Child restraint system ............. 54
How your child should wear the seat belt ................. 32
Installing child restraints ......... 58
Moon roof precautions .......... 165
Power back window precautions ......................... 161
Power window lock switch .... 156
Power window precautions ... 158
Rear door child-protector ...... 123
Removed wireless remote control/electronic key
battery precautions ............. 453
Seat belt extender precautions ........................... 35
Seat belt precautions .............. 57
Seat heater precautions........ 351
Child-protectors....................... 123
Cleaning ........................... 402, 406 Aluminum wheels.................. 403
Exterior ................................. 402
Interior................................... 406
Seat belts .............................. 407
Clock
*
Compass .................................. 397
Condenser ................................ 425
Console box ............................. 358
Consumption screen ....... 103, 109
Cooling system ........................ 423 Capacity ................................ 547
Checking ............................... 423
Engine overheating ............... 534
Preparing and checking before winter....................... 329 Crawl Control ........................... 318
CRS ............................................. 54
Cruise control
Cruise control ....................... 280
Dynamic radar cruise control ................................ 266
Cup holders ............................. 359
Curtain shield airbags............... 37
Customizable features ............ 568
Daytime running light system.................................... 222
Deck hooks .............................. 367
Defogger Outside rear view
mirrors ........................ 340, 347
Windshield .................... 340, 347
Differential................................ 548
Dimensions .............................. 540
Dinghy towing.......................... 201
Display
Drive information .................. 103
Dynamic radar cruise control ................................ 266
LDA (Lane Departure Alert) ....... 258
Multi-information display ....... 102
Warning message................. 489
Do-it-yourself maintenance .... 415
Door lock Doors .................................... 119
Key ....................................... 119
Smart key system ................. 120
Wireless remote control ........ 119
D