2016 TOYOTA 4RUNNER cooling

4527-2. Steps to take in an emergency
4RUNNER (U)_(OM35B23U)
●The needle of the engine coolant temperature gauge (P. 8 1 )
enters the red zone or a loss of engine power is experienced.
(For example, the vehicle speed does not increase.)
●Steam comes out from under the hood.
Stop the vehicle in a safe place and turn off the air conditioning 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

4537-2. Steps to take in an emergency
7
When trouble arises
4RUNNER (U)_(OM35B23U)
Add engine coolant if neces-
sary. (P. 351)
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 inspected at the nearest Toyota dealer.
5
CAUTION
■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 hood 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.

4547-2. Steps to take in an emergency
4RUNNER (U)_(OM35B23U)
NOTICE
■When adding engine coolant
Wait until the engine has cooled down before adding engine coolant.
When adding coolant, do so slowly. 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 sand or dust
etc.).
●Do not use any coolant additives.

4648-1. Specifications
4RUNNER (U)_(OM35B23U)
Cooling system
Capacity11.1 qt. (10.5 L, 9.2 Imp. qt.)
Coolant type
Use either of the following:
• “Toyota Super Long Life Coolant”
• A similar high-quality ethylene glycol-
based non-silicate, non-amine, non-
nitrite, and non-borate coolant with
long-life hybrid organic acid technol-
ogy
Do not use plain water alone.
Ignition system
Spark plug
Make
GapDENSO SK16HR11
0.043 in. (1.1 mm)
NOTICE
■Iridium-tipped spark plugs
Use only iridium-tipped spark plugs. Do not adjust the spark plug gap.

516Alphabetical index
4RUNNER (U)_(OM35B23U)
Child safety ................................ 52
Airbag precautions .................. 37
Back door precautions .......... 116
Battery precautions ....... 361, 451
Child restraint system ............. 53
How your child should
wear the seat belt ................. 31
Installing child restraints ......... 57
Moon roof precautions .......... 155
Power window lock switch .... 145
Power window precautions ... 147
Rear door child-protectors ...... 99
Removed electronic
key battery precautions ...... 381
Seat belt extender
precautions ........................... 34
Seat belt precautions .............. 56
Seat heater precautions........ 291
Child-protectors......................... 99
Cleaning ........................... 334, 337
Aluminum wheels.................. 334
Exterior ................................. 334
Interior................................... 337
Seat belts .............................. 338
Clock ......................................... 309
Compass .................................... 85
Condenser ................................ 356
Console box ............................. 297
Cooling system
Engine overheating ............... 452
Crawl Control ........................... 249
Cruise control .......................... 221
Cup holders.............................. 298
Curtain shield airbags ............... 35
Customizable features ............ 485Daytime running light
system.................................... 208
Defogger
Front windshield ................... 286
Outside rear view
mirrors ........................ 280, 286
Rear window ................. 280, 286
Dimension ................................ 458
Dinghy towing.......................... 190
Display
Multi-information display ......... 81
Trip information....................... 83
Warning message................. 422
Do-it-yourself maintenance .... 346
Door courtesy lights
Wattage ................................ 469
Doors
Automatic door locking
and unlocking system......... 100
Back door ............................. 114
Door lock ........................ 98, 115
Door windows ....................... 145
Open door warning buzzer ... 105
Open door warning light ....... 415
Outside rear view mirrors ..... 143
Rear door child-protector ........ 99
Side doors .............................. 96
Downhill assist control
system.................................... 246
Driver’s seat position
memory .................................. 132
Driving ...................................... 158
Break-in tips.......................... 159
Correct driving posture ........... 28
Driving assist systems .......... 259
Off-road precautions ............. 272
Procedures ........................... 158
Winter drive tips .................... 268D