2020 Lexus GS350 radiator

372
GS350_GS F_OM_OM30J07U_(U)6-2. Maintenance
General maintenance
Listed below are the general maintenanc
e items that should be performed at
the intervals specified in the “Warranty and Service Guide” or “Owner’s
Manual Supplement”. It is recommende d that any problem you notice should
be brought to the attention of your Lexu s dealer or qualified service shop for
advice.
Engine compartment
ItemsCheck points
BatteryCheck the battery fluid level and connections.
(  P. 391)
Brake fluidIs the brake fluid at the correct level? ( P. 390)
Engine coolantIs the engine coolant at the correct level?
( P. 388)
Engine oilIs the engine oil at the correct level? ( P. 385)
Exhaust systemThere should not be any fumes or strange sounds.
Radiator/condenserThe radiator and condenser should be free from for-
eign objects. ( P. 389)
Washer fluidIs there sufficient washer fluid? ( P. 393)

376
GS350_GS F_OM_OM30J07U_(U)6-3. Do-it-yourself maintenance
Do-it-yourself service precautions
*: Vehicles with sing
le-beam headlights
If you perform maintenance by yourself, be sure to follow the correct proce-
dure as given in these sections.
ItemsParts and tools
Battery condition
( P. 391)•Warm water• Baking soda•Grease
• Conventional wrench (for terminal clamp bolts)
Brake fluid level
( P. 390)
• FMVSS No.116 DOT 3 or SAE J1703 brake fluid
• Rag or paper towel
• Funnel (used only for adding brake fluid)
Engine coolant level
( P. 388)
•“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
For the U.S.A.:
“Toyota Super Long Life Coolant” is pre-mixed with 50%
coolant and 50% deionized water.
For Canada:
“Toyota Super Long Life Cool ant” is pre-mixed with 55%
coolant and 45% deionized water.
• Funnel (used only for adding coolant)
Engine oil level
(  P. 385)
• “Toyota Genuine Motor Oil” or equivalent
• Rag or paper towel
• Funnel (used only for adding engine oil)
Fuses ( P. 413)• Fuse with same amperage rating as original
Headlight aim*
(  P. 417)• Phillips-head screwdriver
Light bulbs
( P. 419)
• Bulb with same number and wattage rating as original
• Phillips-head screwdriver•Flathead sc rewdriver
•Wrench
Radiator and con-
denser (P. 389)
Tire inflation pres-
sure (P. 404)• Tire pressure gauge• Compressed air source
Washer fluid
( P. 393)• Water or washer fluid containing antifreeze (for winter use)
• Funnel (used only for adding water or washer fluid)

GS350_GS F_OM_OM30J07U_(U)
3776-3. Do-it-yourself maintenance
6
Maintenance and care
WARNING
The engine compartment contains many mechan isms and fluids that may move suddenly,
become hot, or become electrically energize d. To avoid death or serious injury, observe
the following precautions.
■When working on the engine compartment
●Keep hands, clothing and tools away from the moving fan and engine drive belt.
●Be careful not to touch the engine, radiator, exhaust manifold, etc. right after driving
as they may be hot. Oil and other fluids may also be hot.
●Do not leave anything that may burn easily, such as paper and rags, in the engine
compartment.
●Do not smoke, cause sparks or expose an open flame to fuel or the battery. Fuel and
battery fumes are flammable.
●Be extremely cautious when working on the battery. It contains poisonous and corro-
sive sulfuric acid.
■When working near the electric cooling fans or radiator grille
Be sure the engine switch is off.
With the engine switch in IGNITION ON mode, the electric cooling fans may auto-
matically start to run if the air conditioning is on and/or the coolant temperature is high.
(  P. 389)
■Safety glasses
Wear safety glasses to prevent flying or falling material, fluid spray, etc. from getting in
your eyes.
NOTICE
■If you remove the air cleaner filter
Driving with the air cleaner f ilter removed may cause excessive engine wear due to dirt
in the air.

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.

509
GS350_GS F_OM_OM30J07U_(U)
7
When trouble arises
7-2. Steps to take in an emergency
If your vehicle overheats
●The needle of the engine coolant temperature gauge (P. 92, 98) enters the
red zone or a loss of engine power is experienced. (For example, the vehicle
speed does not increase.)
●“Engine Coolant Temp High Stop in a Safe Place See Owner’s Manual” is
shown on the multi-information display.
●Steam is coming from under the hood.
Stop the vehicle in a safe place and tu rn off the air conditioning system, 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 cooling
core (radiator) for any leaks.
Radiator
Cooling fans
If a large amount of coolant leaks,
immediately contact your Lexus
dealer.
The following may indicate that your vehicle is overheating.
Correction procedures
1
2
3
1
2