2020 LEXUS LS500H radiator cap

3776-3. Do-it-yourself maintenance
6
Maintenance and care
Fuse boxes (P.405)
Engine oil filler cap ( P.381)
Engine coolant reservoir ( P.382)
Intercooler coolant reservoir ( P.382)
Engine oil level dipstick ( P.380)
Brake fluid reservoir ( P.383)
Washer fluid tank ( P.384)
Radiator ( P.383)
Intercooler radiator ( P.383)
Electric cooling fan
Condenser ( P.383)
Intercooler sub radiator ( P.383)
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

3836-3. Do-it-yourself maintenance
6
Maintenance and care
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
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 you are not sure of their condition, have your vehicle
inspected by your Lexus dealer.
■Checking fluid level
The brake fluid level should be
between the “MAX” and “MIN” lines
on the tank.
■Adding fluid
Make sure to check the fluid type and
prepare the necessary item.
 Fluid type
FMVSS No.116 DOT 3 or SAE J1703
brake fluid
FMVSS No.116 DOT 4 or SAE J1704
brake fluid
Item
Clean funnel
■Brake fluid can absorb moisture from
the air
Excess moisture in the brake fluid can cause
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.446)
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 neither 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 damagi ng parts or paint.
Checking the radiator, con-
denser, intercooler radiator (if
equipped) and intercooler sub
radiator (if equipped)
WARNING
■When the engine is hot
Do not touch the radiator, condenser,
intercooler radiator or intercooler sub
radiator as they may be hot and cause
serious injuries, such as burns.
Checking and adding the brake
fluid

4447-2. Steps to take in an emergency
1Stop 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
If your vehicle overheats
The following may indicate that
your vehicle is overheating.
 The engine coolant temperature
gauge ( P.73, 76) 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

4467-2. Steps to take in an emergency
1Remove the engine compartment
cover.
2
Remove the engine cover. ( P.378)
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. ( P.379)
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.
AB
AC
A
B
B
●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.

507Alphabetical Index
Pre-Collision System (PCS)Function ............................................... 205, 216
PCS OFF switch ............................. 208, 218
Warning light ............................................... 425
R
Radar cruise control (dynamic radar cruise control with full-speed range)... 238, 241
Radiator ........................................................... 383
RCD (Rear camera detection) .............. 257 Function .......................................................... 270
Warning message....................................... 271
RCTA Function .......................................................... 266
Warning message..................................... 267
RCTA (Rear Cross Traffic Alert) ......... 257
RCTA function ..............................................267
Rear automatic air conditioning system .......................................................................... 327
Rear Cross Traffic Alert (RCTA) ......... 266
Rear door sunshades ..... ............................ 350
Rear Multi Operation Panel .....................312
Rear seat position memory .......................134
Rear seats .........................................................125 Adjustment...................................................... 126
Head restraints .............................................135
Rear seat position memory .................... 134
Relaxation system........................................128
Seat heaters ..................................................330
Seat ventilators............................................330
Rear side marker lights Light switch .................................................... 180
Replacing light bulbs............................... 408
Rear sunshades ............................................ 352
Rear turn signal lights Replacing light bulbs............................... 408
Turn signal lever ........................................... 175
Rear view mirror Inside rear view mirror............................. 140
Outside rear view mirrors ........................141
Rear window defogger .............................. 318 Refueling
Capacity .......................................................... 451
Fuel types ........................................................ 451
If the fuel filler do or cannot be opened
..........................................................................436
Opening the fuel tank cap ..................... 190
Remote Touch ..............................................308
Replacing Electronic key battery ............................. 403
Fuses................................................................ 405
Light bulbs .................................................... 408
Tires ................................................................. 395
Resetting the message indicating mainte- nance is required ...................................... 368
Rev indicator .................................................... 78
Rev peak............................................................. 78
Road Sign Assist .......................................... 238
RSA (Road Sign Assist) ............................ 238
Run-flat tires....................................... 389, 433
S
Seat belt buckle lights ................................ 334
Seat belt reminder light............................. 422
Seat belts............................................................ 24 Automatic Locking Retractor................. 26
Child restraint system installation ......... 46
Cleaning and maintaining the seat belt......................................................................... 365
Easy Access Buckle .................................... 26
Emergency Locking Retractor .............. 26
How to wear your seat belt ..................... 25
How your child should wear the seat belt ............................................................................. 25
Pregnant women, proper seat belt use ............................................................................. 24
Reminder light and buzzer ................... 422
Seat belt extender......................................... 25
SRS warning light.......................................420
Seat heaters ................................................... 330
Seat position memory....................... 130, 134
Seat ventilators ............................................. 330
Seating capacity.............................................163