2020 LEXUS LS500 coolant temperature

3826-3. Do-it-yourself maintenance
■Engine 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” line
If the level is on or below the “L” line, add
coolant up to the “F” line. (
P.444)
■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” line
If the level is on or below the “L” line, add
coolant up to the “F” line. ( P.444)
■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
WARNING
●Dispose of used oil and filters only in a
safe and acceptable manner. Do not
dispose of used oil and filters in house-
hold trash, in sewers or onto the
ground.
Call your Lexus dealer, service station
or auto parts store for information
concerning recycling or disposal.
●Do not leave used engine oil within the
reach of children.
NOTICE
■To prevent serious engine damage
Check the oil level on a regular basis.
■When replacing the engine oil
●Be careful not to spill engine oil on the
vehicle components.
●Avoid overfilling, or the engine could
be damaged.
●Check the oil level on the dipstick
every time you refill the vehicle.
●Be sure the engine oi l filler cap is prop-
erly tightened.
Checking the coolant
A
B
C
A
B
C

4177-2. Steps to take in an emergency
7
When trouble arises
Fluid leaks under the vehicle.
(Water dripping from the air condi-
tioning after use is normal.)
 Flat-looking tires or uneven tire
wear
 Engine coolant temperature gauge
needle continually points higher
than normal.
 Changes in exhaust sound
 Excessive tire squeal when corner-
ing
 Strange noises related to the sus-
pension system
 Pinging or other noises related to
the engine
 Engine missing, stumbling or run-
ning roughly
 Appreciable loss of power
 Vehicle pulls heavily to one side
when braking 
Vehicle pulls heavily to one side
when driving on a level road
 Loss of brake effectiveness, spongy
feeling, pedal almost touches the
floor
If you think something is
wrong
If you notice any of the following
symptoms, your vehicle probably
needs adjustment or repair. Con-
tact your Lexus dealer as soon as
possible.
Visible symptoms
Audible symptoms
Operational symptoms

4197-2. Steps to take in an emergency
7
When trouble arises
■Brake system warning light (warning buzzer)
■Brake system warning light (warning buzzer)
■High coolant temperature warning light* (warning buzzer)
*: This light illuminates on the multi-information display.
If a warning light turns on or a warning buzzer sounds
Calmly perform the following actions if any of the warning lights comes on or
flashes. If a light comes on or flashes, bu t then goes off, this does not necessar-
ily indicate a malfunction in the system. However, if this continues to occur,
have the vehicle inspected by your Lexus dealer.
Actions to the warning lights or warning buzzers
Warning lightDetails/Actions
(U.S.A.)
or
(red)
(Canada)
Indicates that:
 The brake fluid level is low; or
 The brake system is malfunctioning
 Immediately stop the vehicle in a safe place and contact your Lexus
dealer. Continuing to drive the vehicle may be dangerous.
Indicates that the brake pads are worn out (only the right-side pads can
be detected)
 Have the vehicle inspected by your Lexus dealer.
Warning lightDetails/Actions
(yellow)
Indicates a malfunction in:
The electronically controlled brake sy stem (vehicles with Lexus Safety
System + A); or
 The parking brake system
 Have the vehicle inspected by your Lexus dealer immediately.
Warning lightDetails/Actions
Indicates that the engine coolant temperature is too high
Immediately stop the vehicle in a safe place.
Handling method ( P.444)

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.

502Alphabetical Index
If a warning message is displayed..... 429
If the battery is discharged .................... 439
If the electronic key does not operate properly....................................................... 437
If the engine will not start ....................... 434
If the fuel filler door cannot be opened ......................................................................... 436
If the vehicle is trapped in rising water411
If you have a flat tire .................................. 433
If you lose your keys................................. 436
If you think something is wrong ........... 417
If your vehicle becomes stuck............. 447
If your vehicle has to be stopped in an
emergency ................................................. 410
If your vehicle needs to be towed ....... 413
If your vehicle overheats ........................ 444
Engine ACCESSORY mode .............................. 168
Compartment ..............................................377
Engine compartment cover ................. 378
Engine switch................................................ 165
Fuel pump shut off system ..................... 418
Hood................................................................ 375
How to start the engine........................... 165
Identification number .................................451
If the engine will not start ....................... 434
If your vehicle has to be stopped in an
emergency ................................................. 410
Ignition switch (engine switch) ............ 165
Overheating................................................. 444
Tachometer ............................................. 73, 76
Engine compartment cover .................... 378
Engine coolant Capacity ......................................................... 453
Checking ....................................................... 382
Preparing and checking before winter.........................................................................303
Engine coolant temperature gauge 73, 76
Engine immobilizer system ........................ 63
Engine oil Capacity ......................................................... 452
Checking ...................................................... 380 Preparing and checking before winter
......................................................................... 303
Warning light ...............................................420
Engine oil maintenance data ................... 381
Engine switch ..................................................165 Auto power off function........................... 168
Changing the engine switch modes . 168
If your vehicle has to be stopped in an emergency .................................................. 410
EPS (Electric Power Steering) .............. 298 Warning light ............................................... 422
Event data recorder (E DR) ............................7
F
FCTA (Front Cross Traffic Alert) ......... 223
First-aid kit storage belt ............................ 344
Flat tire
Tire pressure warning system ............ 389
Floor mats ...........................................................22
Fluid Automatic transmission ..........................454
Brake ............................................................... 455
Washer .......................................................... 384
Footwell light ................................................. 334
Front automatic air conditioning system ............................................................................ 317
Front Cross Traffic Alert (FCTA) ......... 223
Front passenger occupant classification system .............................................................. 39
Front seats Adjustment ....................................................... 119
Cleaning ........................................................ 365
Correct driving posture ............................ 23
Driving position memory ........................ 130
Head restraints............................................. 135
Memory recall function............................ 133
Power easy access system .................... 130
Refresh system ..............................................124
Seat heaters ................................................. 330
Seat position memory .............................. 130
Seat ventilators ........................................... 330

511Alphabetical Index
Hands off steering wheel warning (LTA)......................................................................... 237
High coolant temperature ......................419
Intuitive parking assist.................. 265, 423
Low engine oil pressure......................... 420
LTA (Lane Tracing Assist)226, 229, 423
Open door............................................ 101, 103
Open window ............................................... 144
PKSA (Parking Support Alert) ...........258
PKSB (Parking Support Brake) ......... 424
Pop Up Hood ............................................... 421
Pre-collision braking......................205, 217
RCD (Rear Camera Detection) ........ 424
RCTA (Rear Cross Traffic Alert) ...... 424
Seat belt .......................................................... 422
Warning lights.................................................419 ABS .................................................................... 421
Brake hold operated indicator ........... 426
Brake Override System ........................... 421
Brake system .................................................419
Charging system ....................................... 420
Drive-Start Control .................................... 421
Electric power steering .......................... 422
High coolant temperature ......................419
Intuitive parking assist OFF indicator423
Low engine oil pressure......................... 420
Low fuel level ............................................... 422
LTA indicator ............................................... 423
Malfunction indicator lamp................... 420
Master warning light ................................ 426
Parking brake indicator .......................... 425
PKSB OFF indicator ................................ 424
Pop Up Hood ............................................... 421
Pre-collision system ................................. 425
RCD OFF indicator ................................. 424
RCTA OFF indicator............................... 424
Seat belt reminder light .......................... 422
Slip indicator ................................................ 425
SRS.................................................................... 420
Tire pressure ................................................ 423
Warning messages ..................................... 429
Warning reflector storag e belt.............. 344Washer
Adding............................................................ 384
Preparing and checking before winter......................................................................... 303
Switch................................................................ 185
Washing and waxing.................................. 362
Weight Cargo capacity ............................................ 163
Load limits ...................................................... 163
Weight............................................................ 450
Wheels Replacing wheels ...................................... 395
Size ................................................................... 456
Window lock switch .....................................145
Windows Power windows ............................................143
Rear window defogger............................ 318
Washer ............................................................ 185
Windshield wiper de-icer ........................ 323
Windshield wipers Position............................................................. 188
Rain-sensing windshield wipers .......... 185
Winter driving tips....................................... 303
Wireless remote control Battery-Saving Function............................ 112
Locking/Unlocking .....................................98
Replacing the battery .............................. 403
For information regarding the equipment listed below, refer to
the “NAVIGATION AND MULTI-
MEDIA SYSTEM OWNER’S
MANUAL”.
· Navigation system
· Audio/visual system
· Rear seat entertainment system
· Lexus parking assist monitor