coolant temperature LEXUS RCF 2022 User Guide

3007-2. Steps to take in an emergency
RC F Owner's Manual
■Brake system warning light
■High coolant temperature warning light* (warning buzzer)
*: This light illuminates on the multi-information display.
■Charging system warning light
If a warning light turns on or a warning buzzer sounds
Calmly perform the followin g 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
(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.
Warning lightDetails/Actions
Indicates that the engine coolant temperature is too high
 Immediately stop the vehicle in a safe place.
Handling method ( P.336)
Warning lightDetails/Actions
Indicates a malfunction in the vehicle’s charging system
 Immediately stop the vehicle in a safe place and contact your Lexus
dealer.

3367-2. Steps to take in an emergency
RC F Owner's Manual
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.
Cooling fans
Radiator
If a large amount of coolant leaks, immedi-
ately contact your Lexus dealer.
4
The coolant level is satisfactory if it
is between the full (“FULL”) and low
(“LOW”) lines on the reservoir.
Reservoir cap
“FULL”
“LOW”
5 Add coolant if necessary.
Water can be used in an emergency if
If your vehicle overheats
The following may indicate that
your vehicle is overheating.
The engine coolant temperature
gauge ( P.66) is in the red zone
or a loss of engine power is expe-
rienced. (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

3377-2. Steps to take in an emergency
RC F Owner's Manual
7
When trouble arises
coolant is unavailable.
6Start the engine and turn the air
conditioning system on to check
that the radiator cooling fans oper-
ate and to check for coolant leaks
from the radiator or hoses.
The fans operate when the air conditioning
system is turned on immediately after a
cold start. Confirm that the fans are oper-
ating by checking the fan sound and air
flow. If it is difficult to check these, turn the
air conditioning system on and off repeat-
edly.
(The fans may not operate in freezing tem-
peratures.)
7 If the fans are not operating:
Stop the engine immediately and
contact your Lexus dealer.
If the fans are operating:
Have the vehicle inspected at the
nearest Lexus dealer.
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 muff ler) away from the
fans and belts. Failure to do so may
cause the hands or clothing to be
caught, resulting in serious injury.
●While the engine and radiator are hot,
do not loosen or remove the coolant
reservoircap.
High temperature steam or coolant
couldspray 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.

3428-1. Specifications
RC F Owner's Manual
■Engine oil selection
“Toyota Genuine Motor Oil” is used in
your Lexus vehicle. Use Lexus
approved “Toyota Genuine Motor Oil”
or equivalent to satisfy the following
grade and viscosity.
Oil grade: ILSAC GF-6A multigrade
engine oil
Recommended viscosity: SAE 5W-30
SAE 5W-30 is the best choice for
good fuel economy and good starting
in cold weather.
If SAE 5W-30 is not available, SAE
10W-30 oil may be used. However, it
should be replaced with SAE 5W- 30
at the next oil change.
Outside temperature
Oil viscosity (5W-30 is explained here
as an example): • The 5W in 5W-30 indicates the
characteristic of the oil which allows
cold startability. Oils with a lower
value before the W allow for easier
starting of the engine in cold
weather.
• The 30 in 5W-30 indicates the vis- cosity characteristic of the oil when
the oil is at high temperature. An oil
with a higher viscosity (one with a
higher value) may be better suited if
the vehicle is operated at high
speeds, or under extreme load con-
ditions.
How to read oil container label:
The International Lubricant Specifica-
tion Advisory Committee (ILSAC)
Certification Mark is added to some oil
containers to help you select the oil you
should use.
A
Cooling system
Capacity*12.2 qt. (11.5 L, 10.1 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.

397Alphabetical Index
RC F Owner's Manual
Preparing and checking before winter......................................................................... 203
Engine coolant temperature gauge ....... 66
Engine immobilizer system .........................57
Engine oil Capacity ...........................................................341
Checking ....................................................... 265
Low engine oil pressure warning light.......................................................................... 301
Preparing and checking before winter ......................................................................... 203
Engine switch ..................................................128 Auto power off function ............................ 131
Changing the engine switch modes. 130
If your vehicle has to be stopped in an
emergency ................................................ 292
EPS (Electric Power Steering) ................199 Electric power steer ing system warning
light ................................................................ 302
Event data recorder (EDR) ........................... 8
F
First-aid kit storage belt ............................ 225
Flat tire Tire pressure warning system ............. 273
Vehicles with a spare tire ........................ 321
Vehicles without a spare tire .................. 311
Floor mats ...........................................................22
Fluid Automatic transmission .......................... 343
Brake....................................................268, 344
Washer ........................................................... 270
Footwell light ................................................... 221
Front passenger occupant classification system .............................................................. 36
Front seats Adjustment..................................................... 103
Cleaning......................................................... 243
Correct driving posture .............................23
Driving position memory........................ 105
Memory recall function ........................... 106
Power easy access system .................... 105 Seat heaters ....................................................219
Seat position memory .............................. 105
Seat ventilators ..............................................219
Front side marker light Light switch .................................................... 138
Front turn signal lights Replacing light bulbs................................ 287
Turn signal lever .......................................... 136
Fuel Capacity ...........................................................341
Fuel gauge........................................................ 66
Fuel pump shut off system.....................299
Information .................................................... 347
Low fuel level warning light ................. 304
Refueling.......................................................... 150
Type ....................................................................341
Fuel consumption Average fuel economy .............................. 75
Current fuel consumption ........................ 75
Fuel filler door If the fuel filler do or cannot be opened
..........................................................................329
Refueling.......................................................... 150
Fuel gauge ......................................................... 66
Fuel pump shut off system........................ 299
Fuses ................................................................. 283
G
Garage door opener ................................. 229
Gauges ............................................................... 66
Gear Position ....................................................76
G-force................................................................79
Glove box ....................................................... 224
Glove box light ............................................. 224
H
Headlight aim ................................................ 285
Headlights Automatic High Beam system ............. 140
Light switch .................................................... 138
Replacing light bulbs................................ 287

400Alphabetical Index
RC F Owner's Manual
“F” content ......................................................... 77
Gear Position ................................................. 76
G-force.............................................................. 79
History (Lap timer) ...................................... 78
Lap timer ............................................................ 77
LDA (Lane Departure Alert with steering control) ..........................................................166
Menu icons .......................................................74
Meter control switches ...............................74
Navigation system-linked display ..........81
Pop-up display................................................73
Settings ................................................................81
Tire pressure ........................................76, 273
Torque distribution ...................................... 78
Units .................................................................... 76
Vehicle sway warning ................................ 76
Warning message.................................... 308
Warning message display .........................81
N
Navigation system-linked display..............81
Noise from under vehicle ...............................6
O
“ODO TRIP” switch .......................................72
Odometer ..........................................................72
Odometer and trip meter display ............72 Display items ....................................................72
“ODO TRIP” switch ..................................... 72
Oil Differential oil ............................................... 344
Engine oil .........................................................341
Opener Fuel filler door............................................... 150
Hood................................................................ 262
Trunk ................................................................... 96
Outer foot lights Location............................................................ 221
Outside rear view mirrors Adjustment....................................................... 110
BSM (Blind Spot Monitor) ..................... 179 Folding.................................................................. 111
Linked mirror function when reversing111
Mirror position memory .......................... 105
Outside rear view mirror defoggers 215
RCTA function ..............................................179
Outside temperature.................................... 66
Overheating .................................................. 336
P
Paddle shift switches ..........................134, 135
Panic mode ....................................................... 90
Parking brake Operation ........................................................137
Parking brake engaged warning buzzer............................................................................137
Parking brake warning light .................302
Warning message .......................................137
Parking lights Light switch .................................................... 138
Replacing light bulbs................................ 287
PCS (Pre-Collision System) Function ............................................................157
PCS OFF switch ......................................... 159
PCS warning light .................................... 303
Personal lights................................................. 221
Power control unit coolant Preparing and checking before winter..........................................................................203
Power easy access system ....................... 105
Power outlet .................................................. 226
Power steering (Elect ric power steering
system) ............................................................199 Electric power steering system warning light ................................................................302
Power windows Door lock linked window operation ... 113
Jam protection function ............................. 112
Operation ......................................................... 112
Window lock switch.................................... 113
Pre-Collision System (PCS) Function ............................................................157
PCS OFF switch ......................................... 159

404Alphabetical Index
RC F Owner's Manual
Trunk storage extension ........................ 226
Wireless remote control........................... 97
Turn signal lights Replacing light bulbs................................ 287
Turn signal lever ...........................................136
TVD (Toruqe Vectoring Differential) ... 197
V
Vanity lights.................................................... 228
Vanity mirrors ............................................... 228
VDIM (Vehicle Dynamics Integrated Man-
agement)........................................................199
Vehicle data recording ....................................7
Vehicle Dynamics Integrated Manage- ment (VDIM)................................................199
Vehicle identification number ................ 340
Vehicle Stability Control (VSC) .............199
Vehicle sway warning display ....................76
Ventilators (seat ventilators).....................219
VSC (Vehicle Stabilit y Control) .............199
W
Warning buzzer
Open door....................................................304
Warning buzzers Approach warning...................................... 176
Brake Override System ......................... 302
Downshifting ..................................................135
Driver’s and front passenger’s seat belt.........................................................................304
Drive-Start Control .................................. 302
Electric power steering .......................... 302
High coolant temperature ................... 300
LDA (Lane Departure Alert with steering control) ..........................................................164
Low engine oil pressure.......................... 301
Open door.............................................. 93, 94
Open window ................................................ 113
Parking brake .............................................. 302
Pre-collision braking................................. 158
Rear passengers’ seat belt ................... 305 Warning lights...............................................300
ABS.................................................................... 301
Automatic headlight leveling system304
Brake Override System .........................302
Brake system............................................... 300
Charging system....................................... 300
Driver’s and front pa ssenger’s seat belt
reminder light .......................................... 304
Drive-Start Control...................................302
Electric power steering...........................302
High coolant temperature.................... 300
LDA indicator ............................................. 303
Low engine oil pressure .......................... 301
Low fuel level .............................................. 304
Malfunction indicator lamp .................... 301
Master warning light................................ 305
Open door warning ................................ 304
Parking brake indicator ..........................302
Pre-collision system................................. 303
Rear passengers’ seat belt reminder lights ............................................................. 305
Slip indicator................................................ 303
SRS ..................................................................... 301
Tire pressure ............................................... 305
Warning message .......................................308
Warning message display.............................81
Washer Checking ....................................................... 270
Preparing and checking before winter..........................................................................203
Switch.................................................................143
Washing and waxing.................................. 238
Weight Cargo capacity .............................................126
Load limits .......................................................126
Weight............................................................ 340
Wheels ............................................................. 279 Size ....................................................................345
Window lock switch ...................................... 113
Windows Power windows ............................................. 112
Rear window defogger............................ 215