2020 TOYOTA TUNDRA radiator cap

4156-3. Do-it-yourself maintenance
6
Maintenance and care
Engine compartment
Washer fluid tank (P. 425)
Engine oil level dipstick ( P. 416)
Engine coolant reservoir ( P. 418)
Engine oil filler cap ( P. 417)
Brake fluid reservoir ( P. 420) Fuse box (
P. 452)
Battery ( P. 422)
Radiator ( P. 420)
Cooling fan
Condenser ( P. 420)
Power steering fluid reservoir ( P. 421)1
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5
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7
8
9
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4196-3. Do-it-yourself maintenance
6
Maintenance and care
■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.( P. 529)
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.

5287-2. Steps to take in an emergency
The coolant level is satisfactory
if it is between the “FULL” and
“LOW” lines on the reservoir.Reservoir
“FULL”
“LOW”
Radiator cap
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 operate s 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 ins pected at the nearest Toyota dealer.
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5297-2. Steps to take in an emergency
7
When trouble arises
WARNING
■When inspecting under th e 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 wh ile 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 sufficientl y. Adding
cool coolant to a hot engine too quickly can cause damage to th e 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.

603Alphabetical index
Power outlets ........................... 379
Power steering fluid ................ 421
Power windows........................ 172Jam protection function......... 173
Operation .............................. 172
Window lock switch............... 172
Pre-Collision System
(PCS) ...................................... 259
Radar cruise control (dynamic radar
cruise control) ....................... 280
Radiator .................................... 420
Radio
*
Rear personal lights ................ 358
Rear seat Adjustment precautions ........ 151
Child seats/child restraint system installation . ............... 63
Cleaning................................ 403
Head restraints ..................... 157
Raising the bottom cushion ............................... 150
Rear side marker lights ........... 234
Light switch ........................... 234
Replacing light bulbs............. 466
Wattage ................................ 548
Rear step bumper .................... 137
Rear turn signal lights............. 232 Replacing light bulbs............. 466
Turn signal lever ................... 232
Wattage ................................ 548
Rear view mirror
Inside rear view mirror .......... 164
Outside rear view mirrors...... 167
Rear view monitor system
*
Refueling .................................. 248
Capacity................................ 540
Fuel types ............................. 540
Opening the fuel tank cap..... 250
Replacing Fuses .................................... 452
Light bulbs ............................ 455
Tires...................................... 504
Wireless remote control battery ................................ 449
Reporting safety defects for U.S. owners...................... 574
Resetting the message
indicating maintenance
is required.............................. 407
Safety connect ........................... 79
Seat belts ................................... 34 Adjusting the seat belt ............ 35
Automatic Locking Retractor .............................. 36
Child restra int system
installation ............................ 63
Cleaning and maintaining
the seat belt........................ 404
Emergency Locking Retractor .............................. 36
How to wear your seat belt ..... 34
How your child should wear the seat belt.......................... 36
Pregnant women, proper seat belt use ......................... 37
Reminder light and buzzer.... 484
Seat belt extender .................. 36
Seat belt pretensioners........... 35
SRS warning light ................. 483
Seat heaters ............................. 354
Seat position memory ............. 152
Seat ventilators........................ 354
R
S
*: Refer to “NAVIGATION AND MULTIMEDIA SYSTEM OWNER
’S MANUAL”.