radiator cap TOYOTA 4RUNNER 2021 Owners Manual (in English)

4086-3. Do-it-yourself maintenance
4RUNNER (U)
Engine compartment
Washer fluid tank (P. 420)
Power steering fluid reservoir ( P. 416)
Engine oil level dipstick ( P. 410)
Engine coolant reservoir ( P. 412)
Engine oil filler cap ( P. 4 11 ) Brake fluid reservoir
( P. 414)
Fuse box ( P. 446)
Battery ( P. 417)
Condenser ( P. 414)
Radiator ( P. 414)1
2
3
4
5
6
7
8
9
10

4136-3. Do-it-yourself maintenance
6
Maintenance and care
4RUNNER (U)
■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 engine coolant, contact your Toyota deal er.
■ If the coolant level drops within a short time of replenishing
Visually check the radiator, hoses, engine coolant reservoir ca ps, 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 engine coolant reservoir cap or the radiator cap.
(P. 515)
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.

4146-3. Do-it-yourself maintenance
4RUNNER (U)
Check the radiator and condenser and clear away any foreign objects.
If either of the above parts is extremely dirty or you are not sure of
their condition, have your vehic le inspected by your Toyota dea ler.
■Checking fluid level
The brake fluid level should be
between the “MAX” and “MIN”
lines on the tank.
“MAX” line
“MIN” line
■Adding fluid
Make sure to check the fluid ty pe and prepare the necessary ite m.
■Refilling brake fluid
Turn the engine switch off.
Depress the brake pedal more than 40 times.
Remove the reservoir cap by hand. Add brake fluid up to the
“MAX” line.
If you do not follow the procedure above, the reservoir may over-
flow.
Radiator and condenser
WARNING
■ When the engine is hot
Do not touch the radiator or condenser as they may be hot and c ause seri-
ous injuries, such as burns.
Brake fluid
1
2
Fluid type FMVSS No.116 DOT 3 or SAE J1703 brake fluid
Items Clean funnel
1
2
3

5147-2. Steps to take in an emergency
4RUNNER (U)
●The needle of the engine coolant temperature gauge ( P. 8 8 )
enters the red zone o r a loss of engine power is experienced.
(For example, the vehicle speed does not increase.)
● 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 “F” and “L”
lines on the reservoir.Reservoir
“F” line
“L” line
Radiator cap
If your vehicle overheats
The following may indicate that your vehicle is overheating:
Correction procedures
1
2
3
1
2
4
1
2
3
4

5157-2. Steps to take in an emergency
7
When trouble arises
4RUNNER (U)
Add engine coolant if neces-
sary. (P. 409)
Water can be used in an emer-
gency if engine coolant is unavail-
able.
Start the engine to check that the radiator cooling fan operate and
to check for coolant leaks from the radiator or hoses.
If the fan are not operating:
Stop the engine immediately and contact your Toyota dealer.
If the fan are operating:
Have the vehicle ins pected at the nearest Toyota dealer.
5
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 (especially a tie, a scarf or a muffler ) away from
the fans and belts.
6
7
● 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.

587Alphabetical index
4RUNNER (U)
Radiator .................................... 414
Rear differential lock system .................................... 304
Rear seats
Adjustment ............................ 139
Folding down ........ 141, 143, 145
Rear step bumper .................... 132
Rear turn signal lights............. 223
Replacing light bulbs............. 456
Turn signal lever ................... 223
Wattage ................................ 529
Rear view mirror Inside rear view mirror .......... 158
Outside rear view mirrors...... 160
Rear view monitor system
*
Rear window ............................ 166
Rear window defoggers ....................... 342, 349
Rear window wiper .................. 239
Refueling .................................. 242
Capacity ................................ 522
Fuel types ............................. 522
Opening the fuel tank cap ..... 244
Replacing Fuses .................................... 446
Key battery............................ 443
Light bulbs ............................ 449
Tires ...................................... 489
Reporting safety defects
for U.S. owners ...................... 560
Resetting the message indicating maintenance
is required .............................. 399
Roof luggage carrier ............... 186 Safety Connect .......................... 70
Seat belt reminder light .......... 477
Seat belts ................................... 30
Adjusting the seat belt ............ 30
Automatic Locking
Retractor (ALR) .................... 31
Child restra int system
installation ............................ 62
Cleaning and maintaining the seat belt........................ 396
Emergency Locking Retractor (ELR) .................... 31
How to wear your seat belt ..... 30
How your child should wear
the seat belt.......................... 31
Pregnant women, proper
seat belt use ......................... 32
Reminder light and buzzer.... 477
Seat belt extender .................. 31
Seat belt pretensioners........... 31
SRS warning light ................. 475
Seat heaters ............................. 355
Seat position memory ............. 149
Seat ventilators........................ 355
Seating capacity ...................... 191
RS
*: Refer to the “NAVIGATION AND MULTIMEDIA SYSTEM OWNER’S MANUAL”.