2021 Lexus GX460 radiator cap

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GX460_OM_OM60T19U_(U)6-3. Do-it-yourself maintenance
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Maintenance and care
Engine compartment
Power steering fluid reservoir
(P. 467)
Engine oil level dipstick (P. 461)
Engine oil filler cap ( P. 462)
Brake fluid reservoir ( P. 465)
Fuse box ( P. 494)Battery
(P. 468)
Radiator ( P. 465)
Condenser ( P. 465)
Cooling fans
Engine coolant reservoir (P. 463)
Washer fluid tank ( P. 471)1
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GX460_OM_OM60T19U_(U)6-3. Do-it-yourself maintenance
■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-borate 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 Lexus dealer.
■If the coolant level drops within a short time of replenishing
Visually check the radiator, hoses, engine c oolant reservoir cap, radiator cap, drain cock
and water pump. If you cannot find a leak, have your Lexus dealer test the cap and check
for leaks in the cooling system.
WARNING
■When the engine is hot
Do not remove the radiator cap.
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 correct mixture of water and
antifreeze must be used to provide proper lubrication, corrosion protection and cool-
ing. Be sure to read the antifreeze or coolant label.
■If you spill coolant
Be sure to wash it off with water to pr event it from damage to parts or paint.

5547-2. Steps to take in an emergency
GX460_OM_OM60T19U_(U)
The coolant level is satisfactory if it is between the “F” and “L” lines on the res-
ervoir.Reservoir
“F”
“L”
Radiator cap
Add coolant if necessary.
Water can be used in an emergency if
coolant is unavailable.
Start the engine and turn the air conditio ning system on to check that the radi-
ator cooling fans operate and to check for coolant leaks from the radiator or
hoses.
The fans operate when the air conditioning system is turned on immediately after a
cold start. Confirm that the fans are operating by checking the fan sound and air flow.
If it is difficult to check these, turn the air conditioning system on and off repeatedly.
(The fans may not operate in freezing temperatures.)
If the fans are not operating:
Stop the engine immediately an d contact your Lexus dealer.
If the fans are operating:
Have the vehicle inspected at the nearest Lexus dealer.
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5557-2. Steps to take in an emergency
GX460_OM_OM60T19U_(U)
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When trouble arises
WARNING
■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 h ood, 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. Failure to do so may cause the hands or clothing to be caught, resulting in seri-
ous injury.
●Do not loosen the radiator cap or the cool ant reservoir cap while the engine and radi-
ator are hot. High temperature steam or coolant could spray out.
NOTICE
■When adding engine coolant
Add coolant slowly after the engine has cool ed down sufficiently. 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 foreig n matter (such as sand or dust etc.).
●Do not use any coolant additive.

621Alphabetical index
GX460_OM_OM60T19U_(U)
Personal lights........................................400Switch........................................................ 401
Wattage ................................................. 569
Power outlet ............................................. 421
Power windows ...................................... 160 Jam protection function ..................... 161
Operation ............................................... 160
Window lock switch.......................... 160
Pre-Collision System (PCS) ............ 239 Enabling/disabling the system .... 242
Function ..................................................239
Warning light ........................................ 519
Radiator .................................................... 465
Radio
*
Rear seat ....................................................134 Adjustment ............................................. 134
Rear turn signal lights ............................ 211 Replacing light bulbs ....................... 502
Turn signal lever .................................... 211
Wattage ................................................. 569
Rear view mirror Inside rear view mirror ..................... 155
Outside rear view mirrors .............. 157
Rear view monitor system ................ 278
Rear window defogger ...................... 389
Rear window wiper.............................. 226
Refueling .................................................. 229 Capacity .................................................562
Fuel types ...............................................562
Opening the fuel tank cap...............231 Replacing
Electronic key battery ..................... 492
Fuses ........................................................ 494
Light bulbs............................................. 499
Tires ............................................................531
Wireless remote control battery .................................................. 492
Reporting safety defects for U.S. owners .................................. 596
Reset the maintenance data .............449
Safety connect............................................ 71
Seat belts .................................................... 30 Adjusting the seat belt.......................... 31
Automatic Locking Retractor .........32
Child restraint system installation ............................................. 58
Cleaning and maintaining the seat belt ....................................... 446
Emergency Locking Retractor.......32
How to wear your seat belt............. 28
How your child should wear the seat belt ...........................................32
Pregnant women, proper seat belt use......................... 33
Reminder light and buzzer ...........520
Seat belt pretensioners........................ 31
Seat belt extender .................................32
SRS warning light ............................... 518
R
S
*: Refer to the “NAVIGATION SYSTEM OWNER’S MANUAL” or “MULTIMEDIA OWNER’S MANUAL”.