2023 TOYOTA TUNDRA HYBRID cooling

5377-2. Steps to take in an emergency
Owners Manual_USA_M0C052_en
7
When trouble arises
6 Start the hybrid system to
check that the radiator cool-
ing fan operates and to check
for coolant leaks from the
radiator or hoses.
7 If the fan is not operating:
Stop the hybrid system
immediately and contact your
Toyota dealer.
If the fan is operating:
Have the vehicle inspected at
the nearest Toyota dealer.
8 Check if “Engine Coolant
Temp High Stop in a Safe
Place See Owner’s Manual”
is shown on the multi-infor-
mation display.
If the message does not disappear:
Stop the hybrid system and contact
your Toyota dealer.
If the message is not displayed:
Have the vehicle i nspected at the
nearest Toyota dealer.
WARNING
■When inspecting under the
hood of your vehicle
Observe the following precau-
tions.
Failure to do so may result in seri-
ous injury such as burns.
●If steam is seen coming from
under the hood, do not open the
hood until the steam has sub-
sided. The engine compart-
ment may be very hot.
●After the hybrid system has
been turned off , check that the
“READY” indicator is off. When
the hybrid system is operating,
the gasoline engine may auto-
matically start, or the cooling fan
may suddenly operate even if
the gasoline engine stops. Do
not touch or approach rotating
parts such as the fan, which
may lead to fingers or clothing
(especially a tie, a scarf or a
muffler) getting caught, resulting
in serious injury.
●Do not loosen the coolant reser-
voir caps, while the hybrid sys-
tem and radiator are hot.
High temperature steam or
coolant could spray out.
NOTICE
■When adding coolant
Add coolant slowly after the
hybrid system has cooled down
sufficiently. Adding cool coolant to
a hot hybrid system too quickly
can cause damage to the hybrid
system.
■To prevent damage to the
cooling system
Observe the following precau-
tions:
●Avoid contaminating the coolant
with foreign matter (such as
sand or dust, etc.,).
●Do not use any coolant additive.

5448-1. Specifications
Owners Manual_USA_M0C052_en
Oil viscosity (0W-20 is explained
here as an example):
• The 0W in 0W-20 indicates the characteristic of the oil
which allows cold startability.
Oils with a lower value before
the W allow for easier starting
of the engine in cold weather.
• The 20 in 0W-20 indicates the viscosity characteristic of the
oil when the oil is at high tem-
perature.
How to read oil container label:
The International Lubricant Specification Advisory Commit-
tee (ILSAC) Certification Mark is
added to some oil containers to
help you select the oil you
should use.
*: The fluid capacity is a reference quantity.
If replacement is necessary, contact your Toyota dealer.
Cooling system
Capacity*
Gasoline
engine13.1 qt. (12.4 L , 10.9 Imp.qt.)
Intercooler4.6 qt. (4.4 L, 3.9 Imp.qt.)
Power con-
trol unit2.2 qt. (2.1 L, 1.8 Imp.qt.)
Coolant type
Use 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 tech-
nology
Do not use plain water alone.
Ignition system (spark plug)
MakeDENSO EC22HPR-D7
Gap0.027 in. (0.7 mm)

Owners Manual_USA_M0C052_en
Alphabetical Index595
Seat belt extender precautions............................................. 30
Seat belt precautions ............. 52
Child-protectors .. ................... 116
Cleaning .......................... 442, 445 Aluminum wheel ornaments . 442
Aluminum wheels ................. 442
Exterior ................................. 442
Interior .................................. 445
Radar sensor........................ 226
Seat belts ............................. 445
Clock ......................................... 91
Coat hooks .............................. 426
Condenser .............................. 461
Console box ............................ 415
Console box light ................... 410
Consumption screen.............. 106
Coolant .................................... 460 Checking .............................. 460
Cooling system ...................... 460 Engine overheating .............. 535
Coussins gonflables Modification et é limination en fin
de vie des coussins gonflables ........................................... 583
Crawl Control .......................... 365
Cruise control Dynamic radar cruise control with full-speed range .......... 256
Cup holders ............................ 414
Current fuel consumption ....... 97
Curtain shield airbags ............. 36
Customizable features ........... 561D
DAC ..........................................372
Daytime running light system211
Daytime running lights Replacing light bulbs ............490
Deck divider ............................417
Defogger Outside rear view mirrors .....401
Rear window.........................401
Windshield ............................401
Differential ...............................546
Digital Rear-view Mirror .........146
Dimension ...............................540
Dinghy towing .........................194
Display Dynamic radar cruise control with full-speed range ..........256
Head-up display ...................102
Intuitive parking assist ..........274
LTA (Lane Tracing Assist) .....248
Multi-information display.........95
Warning messages ............... 511
Display change button .............93
Distance until next engine oil change .....................................93
Do-it-yourself maintenance ...449
Door courtesy lights...............410
Door lock Side doors ............................ 113
Smart key system .................128
Wireless remote control........ 111
Doors Automatic door locking and unlocking system ................ 116
Door glasses ........................160
Door lock .............................. 113
Open door warning buzzer . 114, 11 6
Outside rear view mirrors .....155
Rear door child-protectors .... 116
Side doors ............................ 113