2021 TOYOTA 4RUNNER cooling

5167-2. Steps to take in an emergency
4RUNNER (U)
NOTICE
■When adding engine coolant
Wait until the engine has cooled down before adding engine cool ant.
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 sa nd or dust
etc.).
● Do not use any coolant additives.

5248-1. Specifications
4RUNNER (U)
How to read oil container label:
The International Lubricant Specification Advisory Committee
(ILSAC) Certification Mark is added to some oil containers to help
you select the o il you should use.
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 pl ug gap.

581Alphabetical index
4RUNNER (U)
Child safety ................................ 52Airbag precautions .................. 37
Back door precautions .......... 133
Battery precautions ....... 418, 513
Child restraint system ............. 53
How your child should
wear the seat belt ................. 31
Installing child restraints ......... 57
Moon roof precautions .......... 173
Power window lock switch .... 162
Power window precautions ... 165
Rear door child-protectors .... 114
Removed electronic key battery precautions ...... 445
Seat belt extender precautions ........................... 34
Seat belt precautions .............. 56
Seat heater precautions........ 355
Child-protectors....................... 114
Cleaning ........................... 392, 395 Exterior ................................. 392
Interior................................... 395
Seat belts .............................. 396
Wheels and wheel ornaments .......................... 393
Clock ......................................... 373
Compass .................................... 92
Condenser ................................ 414
Console box ............................. 361
Cooling system Engine overheating ............... 514
Crawl Control ........................... 310
Cruise control Dynamic radar cruise control................................. 272
Cup holders.............................. 362
Curtain shield airbags ............... 35
Customizable features ............ 545 Daytime running light
system.................................... 228
Defogger Front windshield ................... 349
Outside rear view
mirrors ........................ 342, 349
Rear window ................. 342, 349
Dimension ................................ 520
Dinghy towing.......................... 208
Display Dynamic radar cruise control ................................ 272
LDA
(Lane Departure Alert) ....... 264
Multi-information display ......... 90
Trip information....................... 90
Warning message................. 484
Do-it-yourself maintenance .... 404
Door courtesy lights Wattage ................................ 529
Doors Automatic door locking
and unlocking system......... 115
Back door ............................. 131
Door lock ...................... 113, 132
Door windows ....................... 162
Open door warning buzzer ... 120
Open door warning light ....... 476
Outside rear view mirrors ..... 160
Rear door child-protector ...... 114
Side doors ............................ 110
Downhill assist control
system.................................... 307
Drive-Start Control .................. 177
Driver’s seat position memory .................................. 149D