2019 LEXUS LS500 radiator cap

3736-3. Do-it-yourself maintenance
LS500_OM_(U)_1810 6
Maintenance and care
Fuse boxes (  P.401)
Engine oil filler cap (  P.376)
Engine coolant reservoir (  P.377)
Intercooler coolant reservoir (  P.377)
Engine oil level dipstick (  P.375)
Brake fluid reservoir (  P.379)
Washer fluid tank (  P.379)
Radiator (  P.378)
Intercooler radiator (  P.378)
Electric cooling fan
Condenser (  P.378)
Intercooler sub radiator (  P.378)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

378 6-3. Do-it-yourself maintenance
LS500_OM_(U)_1810 “F” line
“L” lineIf the level is on or below the “L” line, add
coolant up to the “F” line. (  P.440)■
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.440)
■
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.442)
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)

440 7-2. Steps to take in an emergency
LS500_OM_(U)_1810 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.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

442 7-2. Steps to take in an emergency
LS500_OM_(U)_1810 1 Remove the engine compartment
cover.
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.).

5051-1. What to do if... (Troubleshooting)
LS500_OM_(U)_1810 505Alphabetical Index
Operation........................................................ 142
Window lock switch .................................. 144
Pre-Collision System (PCS)
Function ................................................204, 215
PCS OFF switch .............................. 207, 217
Warning light ................................................. 421 R
Radar cruise control (dynamic radar cruise
control with full-speed range).. 237, 247
Radiator ........................................................... 378
RCD (Rear camera detection) .............. 255
Warning message.....................................268
RCD (Rear Camera Detection)
Function .......................................................... 267
RCTA
Function .......................................................... 263
Warning message..................................... 264
RCTA (Rear Cross Traffic Alert) ......... 255
RCTA function ............................................. 264
Rear automatic air conditioning system
.......................................................................... 323
Rear Cross Traffic Alert (RCTA) ......... 263
Rear door sunshades ................................. 347
Rear Multi Operation Panel ...................308
Rear seat position memory .......................134
Rear seats ......................................................... 126
Adjustment...................................................... 126
Head restraints .............................................135
Rear seat position memory .................... 134
Relaxation system........................................ 129
Seat heaters .................................................. 326
Seat ventilators............................................ 326
Rear side marker lights
Light switch ..................................................... 179
Replacing light bulbs................................404
Rear sunshades ............................................ 348
Rear turn signal lights
Replacing light bulbs................................404
Turn signal lever ........................................... 173
Rear view mirror
Inside rear view mirror..............................139 Outside rear view mirrors...................... 140
Rear window defogger ...............................314
Refueling
Capacity ......................................................... 447
Fuel types ....................................................... 447
If the fuel filler do or cannot be opened
.......................................................................... 432
Opening the fuel tank cap ..................... 189
Remote Touch .............................................. 304
Replacing
Electronic key battery ............................. 399
Fuses.................................................................. 401
Light bulbs .................................................... 404
Tires ................................................................... 391
Resetting the message indicating mainte-
nance is required ...................................... 364
Rev indicator .................................................... 78
Rev peak............................................................. 78
Road Sign Assist ...........................................247
RSA (Road Sign Assist) .............................247
Run-flat tires........................................384, 429
S
Seat belt buckle lights ..................................331
Seat belt reminder light.................... 418, 419
Seat belts............................................................ 24
Automatic Locking Retractor................. 26
Child restraint system installation ......... 46
Cleaning and maintaining the seat belt
........................................................................... 361
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 ..........418, 419
Seat belt extender......................................... 25
SRS warning light........................................ 416
Seat heaters ................................................... 326
Seat position memory....................... 130, 134