2018 LEXUS LS500 cooling

3776-3. Do-it-yourself maintenance
LS500_OM_OM50F54U_(U) 6
Maintenance and care
Fuse boxes ( → P.405)
Engine oil filler cap ( → P.380)
Engine coolant reservoir ( → P.381)
Intercooler coolant reservoir ( → P.381)
Engine oil level dipstick ( → P.379)
Brake fluid reservoir ( → P.383)
Washer fluid tank ( → P.383)
Radiator ( → P.382)
Intercooler radiator ( → P.382)
Electric cooling fan
Condenser ( → P.382)
Intercooler sub radiator ( → P.382)For AWD models:
The engine oil level dipstick is locate d on the opposite side of the engine.Engine compartment
Components
A
B
C
D
E
F
G
H
I
J
K
L

382 6-3. Do-it-yourself maintenance
LS500_OM_OM50F54U_(U) “F” line
“L” lineIf the level is on or below the “L” line, add
coolant up to the “F” line. ( → P.443)■
Intercooler coolant reservoir
The coolant level is satisfactory if it is
between the “F” and “L” lines on the
reservoir when the engine is cold.
Reservoir cap
“F” line
“L” lineIf the level is on or below the “L” line, add
coolant up to the “F” line. ( → P.443)
■
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 mix-
ture of 50% coolant and 50% deionized
water. (Minimum temperature: -31°F
[-35°C])
Canada:
“Toyota Super Long Life Coolant” is a mix-
ture 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 radi ator, hoses, engine
coolant reservoir caps, 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.
Check the radiator, condenser, inter-
cooler radiator and intercooler sub
radiator and clear away any foreign
objects. If either of the above parts is
extremely dirty or yo u are not sure of
their condition, have your vehicle
inspected by your Lexus dealer.B
C
A
B
C WARNING■
When the engine is hot
Do not remove the engine coolant reser-
voir cap, the intercooler coolant reser-
voir cap and the coolant inlet cap.
( → P.445)
The cooling system may be under pres-
sure and may spray hot coolant if the cap
is removed, causing serious injuries, such
as burns.
NOTICE■
When adding coolant
Coolant is neithe r plain water nor
straight antifreeze. The correct mixture
of water and antifreeze must be used to
provide proper lubrication, corrosion
protection and cooling. Be sure to read
the antifreeze or coolant label.
■
If you spill coolant
Be sure to wash it off with water to pre-
vent it from damaging parts or paint.
Checking the radiator, con-
denser, intercooler radiator (if
equipped) and intercooler sub
radiator (if equipped)

442 7-2. Steps to take in an emergency
LS500_OM_OM50F54U_(U) WARNING■
When removing the battery terminals
Always remove the negative (-) terminal
first. If the positive (+) terminal contacts
any metal in the surrounding area when
the positive (+) terminal is removed, a
spark may occur, leadin g to a fire in addi-
tion to electrical shocks and death or
serious injury. ■
Avoiding battery fires or explosions
Observe the following precautions to
prevent accidentally igniting the flamma-
ble gas that may be emitted from the bat-
tery: ●
Make sure each jumper cable is con-
nected to the correct terminal and that
it is not unintentiona lly in contact with
any other than the intended terminal.●
Do not allow the other end of the
jumper cable connected to the “+” ter-
minal to come into contact with any
other parts or metal surfaces in the
area, such as brackets or unpainted
metal.●
Do not allow the + and - clamps of the
jumper cables to come into contact
with each other.
●
Do not smoke, use matches, cigarette
lighters or allow open flame near the
battery.
■
Battery precautions
The battery contains poisonous and cor-
rosive acidic electrolyte, while related
parts contain lead and lead compounds.
Observe the following precautions when
handling the battery:
●
When working with the battery, always
wear safety glasses and take care not
to allow any battery fluids (acid) to
come into contact with skin, clothing
or the vehicle body.
●
Do not lean over the battery. ●
In the event that battery fluid comes
into contact with the skin or eyes,
immediately wash the affected area
with water and seek medical attention.
Place a wet sponge or cloth over the
affected area until medical attention
can be received. ●
Always wash your ha nds after handling
the battery support, terminals, and
other battery-related parts. ●
Do not allow children near the battery. ■
After recharging the battery
Have the battery inspected at your Lexus
dealer as soon as possible.
If the battery is deteriorating, continued
use may cause the battery to emit a mal-
odorous gas, which may be detrimental
to the health of passengers. ■
When replacing the battery ●
When the vent plug and indicator are
close to the hold down clamp, the bat-
tery fluid (sulfuric acid) may leak. ●
For information regarding battery
replacement, contact your Lexus
dealer. ●
After replacing, se curely attach the
exhaust hose and exhaust hole plug to
the exhaust hole of the replaced bat-
tery. If not properly installed, gases
(hydrogen) may leak into the vehicle
interior, and there is the possible dan-
ger of the gas igniting and exploding.
NOTICE
■
When handling jumper cables
When connecting the jumper cables,
ensure that they do not become entan-
gled in the cooling fan or engine drive
belt.
■
To prevent damaging the vehicle
The exclusive jump starting terminal is to
be used when chargi ng the battery from
another vehicle in an emergency. It can-
not be used to jump start another vehicle.

4437-2. Steps to take in an emergency
LS500_OM_OM50F54U_(U) 7
When trouble arises
1 Stop the vehicle in a safe place and
turn off the air conditioning system,
and then stop the engine.
2 If you see steam:
Carefully lift the hood after the
steam subsides.
If you do not see steam:
Carefully lift the hood.
3 After the engine has cooled down
sufficiently, inspect the hoses and radiator core (radiator) for any
leaks.
Radiators
Cooling fan If a large amount of coolant leaks, immedi-
ately contact your Lexus dealer.
4 The coolant level is satisfactory if it
is between the “F” and “L” lines on
the reservoir.
 Engine
Reservoir
“F” line
“L” line
Coolant inlet cap
 IntercoolerIf your vehicle overheats The following may indicate that
your vehicle is overheating.
 The engine coolant temperature
gauge ( → P.69, 72) is in 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 comes out from under the
hood.
Correction procedures A
B
A
B
C
D

444 7-2. Steps to take in an emergency
LS500_OM_OM50F54U_(U) Reservoir
“F” line
“L” line
5 Add coolant if necessary.Water can be used in an emergency if
coolant is unavailable.
 Engine →
P.444
 Intercooler Remove the engine compartment cover
and add coolant. 6 Start the engine and turn the air
conditioning system on to check
that the radiator cooling fan oper-
ates and to check for coolant leaks
from the radiator or hoses. The fan operates when the air conditioning
system is turned on immediately after a
cold start. Confirm that the fan is operating
by checking the fan sound and air flow. If it
is difficult to check these, turn the air con-
ditioning system on and off repeatedly.
(The fan may not oper ate in freezing tem-
peratures.)
7 If the fan is not operating:
Stop the engine immediately and
contact your Lexus dealer.
If the fan is operating:
Have the vehicle inspected at the
nearest Lexus dealer. ■
When adding engine coolant
Add coolant in accordance with the follow-
ing procedure.
1 Remove the engine compartment
cover.A
B
C

4457-2. Steps to take in an emergency
LS500_OM_OM50F54U_(U) 7
When trouble arises 2 Remove the engine cover.
Lift the front of the engine cover straight up
and then pull it forward.
3 Remove the caps and .
4 Add coolant through the inlet of the cap
up to the “F” line , and then
replace the cap .
5 Add coolant through the inlet of the cap
until it is full, and then replace the
cap .
6 Install the engine compartment cover
and engine cover.
Engage the claws of the engine cover to
install it. A B
A C
A
B
B 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
hood, do not open the hood until the
steam has subsided. The engine com-
partment may be very hot. ●
Keep hands and clothing (especially a
tie, a scarf or a muffler) away from the
fan and belts.
Failure to do so may cause the hands
or clothing to be caught, resulting in
serious injury. ●
Do not loosen the coolant inlet cap,
the engine coolant reservoir cap or the
intercooler coolant reservoir cap while
the engine and radiator are hot.
High temperature steam or coolant
could spray out.
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 sys-
tem
Observe the following precautions:
●
Avoid contaminating the coolant with
foreign matter (such as sand or dust
etc.).
●
Do not use any coolant additive.

4518-1. Specifications
LS500_OM_OM50F54U_(U) 8
Vehicle specifications containers to help you select the oil you
should use.
Cooling system Capacity 
Engine
2WD models: 11.2 qt. (10.6 L, 9.3 Imp. qt.)
AWD models: 11.1 qt. (10.5 L, 9.2 Imp. qt.) 
Intercooler
4.5 qt. (4.3 L, 3.8 Imp. qt.)
Coolant type Use either of the following:
• “Toyota Super Long Life Coolant”
• Similar high-quality ethylene glycol-based non-silicate,
non-amine, non-nitrite, and non-borate coolant with
long-life hybrid orga nic acid technology
Do not use plain water alone.
Ignition system (spark plug) Make DENSO EC22HPR-D7
Gap 0.028 in. (0.7 mm)
NOTICE
■
Iridium-tipped spark plugs
Use only iridium-tipped spark plugs. Do not adjust the spark plug gap.

498 Alphabetical Index
LS500_OM_OM50F54U_(U) Brightness control
Instrument panel light control ..........71, 75
BSM (Blind Spot Monitor).........................251 C
Card key ............................................................ 92
Care
Aluminum wheels ...................................... 362
Exterior ........................................................... 362
Interior .............................................................365
Seat belts........................................................365
Cargo capacity.............................................. 158
Cargo net ....................................................... 339
Center Display ............................................. 306
Chains ..............................................................300
Child restraint system
Fixed with a LATCH system .................. 53
Fixed with a seat belt................................... 49
Front passenger occupa nt classification
system ............................................................. 40
Points to remember .................................... 45
Riding with children ..................................... 45
Types of child restraint system installation
method ........................................................... 46
Using an anchor bracket .......................... 55
Child safety
Airbag precautions...................................... 34
Battery precautions ......................385, 442
Child restraint system................................. 46
Heated steering wheel and seat heater
precautions................................................ 326
How your child should wear the seat belt
............................................................................ 25
Moon roof precautions ............................143
Panoramic moon roof precautions .... 147
Power window lock switch.......................141
Power window precautions .................. 140
Rear door child-protectors ..................... 99
Removed electronic key battery precau-
tions ...............................................................404
Seat belt extender precautions ............. 25
Seat belt precautions .................................. 45 Trunk precautions.......................................100
Child-protectors............................................. 99
Cleaning
Aluminum wheels ......................................362
Exterior............................................................362
Interior ............................................................ 365
Radar sensor .............................. 190, 191, 197
Seat belts ....................................................... 365
Clock ................................................ 69, 72, 344
Clock light ...................................................... 330
Coat hooks..................................................... 343
Coin holder .................................................... 336
Condenser ..................................................... 382
Console box .................................................. 337
Consumption screen .................................... 87
Cooling system.............................................. 381
Engine overheating................................... 443
Cornering lights ............................................. 177
Cruise control
Dynamic radar cruise control with
full-speed range ........................... 238, 241
Cup holders ................................................... 336
Current fuel consumption .......................... 78
Curtain shield airbags .................................. 29
Customizable features .............................. 468
D
Daytime running light system ................... 175
Defogger
Outside rear view mirrors.......................314
Rear window ..................................................314
Windshield ......................................................314
Differential
Front differential oi l............. .............. .........452
Rear differential oil......... .......... ........... .......453
Dimension ...................................................... 448
Dinghy towing.................................................159
Display
Center Display ........................................... 306
Dynamic radar cruise control with
full-speed range ........................................241
Head-up display............................................83