2020 Lexus GS F radiator cap

381
GS350_GS F_OM_OM30J07U_(U)6-3. Do-it-yourself maintenance
6
Maintenance and care
Engine compartment
GS350
Fuse boxes (
P. 413)
Battery ( P. 391)
Engine oil level dipstick (P. 385)
Engine coolant reservoir (P. 388)
Engine oil filler cap ( P. 386) Brake fluid reservoir
(P. 390)
Washer fluid tank ( P. 393)
Electric cooling fans
Condenser ( P. 389)
Radiator ( P. 389)1
2
3
4
5
6
7
8
9
10

382
GS350_GS F_OM_OM30J07U_(U)6-3. Do-it-yourself maintenance
GS F
Fuse boxes (
P. 413)
Battery ( P. 391)
Engine oil level dipstick (P. 385)
Engine coolant reservoir (P. 388)
Engine oil filler cap ( P. 386) Brake fluid reservoir
(P. 390)
Washer fluid tank ( P. 393)
Electric cooling fans
Condenser ( P. 389)
Radiator ( P. 389)1
2
3
4
5
6
7
8
9
10

388
GS350_GS F_OM_OM30J07U_(U)6-3. Do-it-yourself maintenance
The coolant level is satisfactory if it
is between the “FULL”/“F” and “LOW”/“L”
lines on the reservoir when the engine is cold.
■Engine coolant reservoir
Reservoir cap
“FULL” line
“LOW” line
If the level is on or below the “LOW” lin e, add coolant up to the “FULL” line.
(  P. 509)
■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 mixt ure of 50% coolant and 50% deionized water.
(Minimum temperature: -31 F [-35 C])
Canada:
“Toyota Super Long Life Cool ant” is a mixture of 55% coolant and 45% deionized water.
(Minimum temperature: -44 F [-42C])
For more details about coolant, contact your Lexus dealer.
■If the coolant level drops within a short time of replenishing
Visually check the radiator, hoses, engine coolant reservoir caps, drain cock and water
pump.
If you cannot find a leak, have your Lexus de aler test the cap and check for leaks in the
cooling system.
Coolant
1
2
3
GS350GS F

GS350_GS F_OM_OM30J07U_(U)
3896-3. Do-it-yourself maintenance
6
Maintenance and care
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 condi-
tion, have your vehicle inspected by your Lexus dealer.
WARNING
■When the engine is hot
Do not remove the engine coolant reservoir cap or the coolant inlet cap. ( P. 512)
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 prevent it from damaging parts or paint.
Radiator and condenser
WARNING
■When the engine is hot
Do not touch the radiator or condenser as they may be hot and cause serious injuries,
such as burns.

5107-2. Steps to take in an emergency
GS350_GS F_OM_OM30J07U_(U)
The coolant level is satisfactory if it is between the “FULL”/“F” and “LOW”/“L”
lines on the reservoir.
Engine coolant reservoir
“FULL”/“F”
“LOW”/“L”
Coolant inlet cap
Add coolant if necessary.
Water can be used in an emerge ncy 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.)
4
1
2
3
4
GS350GS F
5
GS350GS F
6

5127-2. Steps to take in an emergency
GS350_GS F_OM_OM30J07U_(U)
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.
NOTICE
■When adding engine coolant
Add coolant slowly after the engine has cooled 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.
●GS350: Do not loosen the coolant inlet capor the engine coolant reservoir cap while the
engine and radiator are hot.
High temperature steam or coolant could
spray out.
●GS F: Do not loosen the engine coolant res-
ervoir cap while the engine and radiator are
hot.
High temperature steam or coolant could
spray out.

589Alphabetical index
GS350_GS F_OM_OM30J07U_(U)
Radar cruise control (dynamic radar cruise control with
full-speed range) ............................... 266
Radiator .................................................... 389
Radio
*
RBDS (Radio Broadcast Data Systems)
*
Rear air conditioning system ........... 329
Rear door sunshades .......................... 349
Rear personal lights............................. 338
Rear side marker lights ...................... 222 Light switch ........................................... 222
Replacing light bulbs ..........................421
Welcome light illumination control ......................... 144
Rear seat heaters.................................. 333
Rear sunshade ....................................... 349 Operation ..............................................349
Reverse operation feature............ 350 Rear turn signal lights ........................... 216
Replacing light bulbs ......................... 421
Turn signal lever ................................... 216
Rear view mirror Inside rear view mirror...................... 175
Outside rear view mirrors .............. 177
Rear view monitor system
*
Rear window defoggers .....................324
Refueling...................................................234 Capacity...................................................519
Fuel types.................................................519
Opening the fuel tank cap ............ 236
When the fuel filler door cannot be opened ..........................237
Remote Touch
*...................................... 312
Replacing Electronic key battery .........................411
Fuses .......................................................... 413
Light bulbs...............................................419
Tires .......................................................... 473
Rev indicator ..................................... 94, 101
Rev peak ............................................94, 102
Reporting safety defects for U.S. owners .................................. 560
Resetting the message indicating maintenance is required .................. 371
R
*: Refer to the “NAVIGATION AND MULTIMEDIA SYSTEM OWNER’S MANUAL”.