2019 LEXUS RC350 coolant temperature

2827-2. Steps to take in an emergency
RC350AWD_RC350_RC300AWD_RC30
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■Brake system warning light
■High coolant temperature warning light* (warning buzzer)
*: This light illuminates on the multi-information display.
■Charging system warning light*
*: Except F SPORT models: This light illuminates on the multi-information display.
F SPORT models: This light illuminates on the meter.
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
(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.309)
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.

3097-2. Steps to take in an emergency
RC350AWD_RC350_RC300AWD_RC30
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7
When trouble arises
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.
 RC350/RC300 AWD
WARNING
●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 hands after handling
the battery support, terminals, and
other battery-related parts.
●Do not allow children near the battery.
NOTICE
■When handling jumper cables
When connecting the jumper cables,
ensure that they do not become entan-
gled in the cooling fans or engine drive
belt.
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

3127-2. Steps to take in an emergency
RC350AWD_RC350_RC300AWD_RC30
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WARNING
●RC350/RC300 AWD: While the
engine and radiator are hot, do not
loosen or remove the coolant reser-
voir cap or coolant inlet cap. (The
coolant inlet cap is located under the
engine cover.)
High temperature steam or coolant
could spray out.
●RC300: While the engine and radia-
tors are hot, do not loosen or remove
the coolant reservoir cap, coolant inlet
cap, or intercooler coolant reservoir
cap.
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.

3198-1. Specifications
RC350AWD_RC350_RC300AWD_RC30
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8
Vehicle specifications
Outside temperature
Oil viscosity (0W-20 is explained here
as an example):
• The 0W in 0W-20 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 20 in 0W-20 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.
*: The fluid capacity is a reference quantity. If replacement is necessary, contact your Lexus dealer.
A
Cooling system
Capacity*
RC350/RC3
00 AWD10.0 qt. (9.5 L, 8.4 Imp. qt.)
RC300
Gasoline engine
8.5 qt. (8.0 L, 7.0 Imp. qt.)
Intercooler
3.3 qt. (3.1 L, 2.7 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.

3338-1. Specifications
RC350AWD_RC350_RC300AWD_RC30
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8
Vehicle specifications
cornering (turning) traction.
■Temperature A, B, C
The temperature grades are A (the
highest), B, and C, representing the
tire’s resistance to the generation of
heat and its ability to dissipate heat
when tested under controlled condi-
tions on a specified indoor laboratory
test wheel.
Sustained high temperature can cause the
material of the tire to degenerate and
reduce tire life, and excessive temperature
can lead to sudden tire failure. Grade C corresponds to
a level of perfor-
mance which all passenger car tires must
meet under the Fede ral Motor Vehicle
Safety Standard No. 109.
Grades B and A represent higher levels of
performance on the laboratory test wheel
than the minimum required by law.
Warning: The temperature grades of a tire
assume that it is properly inflated and not
overloaded.
Excessive speed, unde rinflation, or exces-
sive loading, either separately or in combi-
nation, can cause heat buildup and
possible tire failure.
Glossary of tire terminology
Tire related termMeaning
Cold tire inflation pressure
Tire pressure when the vehicle has been parked for
three hours or more, or has not been driven more
than 1 mile or 1.5 km under that condition
Maximum inflation pressureThe maximum cold inflated pressure to which a tire
may be inflated, shown on the sidewall of the tire
Recommended inflation pressureCold tire inflation pressure recommended by a
manufacturer
Accessory weight
The combined weight (in excess of those standard
items which may be replaced) of automatic trans-
mission, power steering, power brakes, power win-
dows, power seats, radio and heater, to the extent
that these items are available as factory-installed
equipment (whether installed or not)
Curb weight
The weight of a motor vehicle with standard equip-
ment, including the maximum capacity of fuel, oil
and coolant, and if so equipped, air conditioning
and additional weight optional engine

376Alphabetical Index
RC350AWD_RC350_RC300AWD_RC30
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Checking .......................................................250
Preparing and checking before winter .... 196
Engine coolant temperature gauge ....... 66
Engine immobilizer system .........................57
Engine oil Capacity .......................................................... 318
Checking ....................................................... 248
Preparing and checking before winter ....196
Warning light ............................................... 283
Engine oil maintenance data .................. 250
Engine oil pressure gauge ...........................74
Engine oil temperature gauge ...................74
Engine switch ..................................................125 Auto power off function ........................... 127
Changing the engine switch modes.. 126
If your vehicle has to be stopped in an
emergency ................................................ 274
EPS (Electric Power Steering) ................192 Warning light ............................................... 284
Event data recorder (EDR) ............................6
F
First-aid kit storage belt ..............................219
Flat tire Tire pressure warning system .............258
Vehicles with a spare tire ...................... 294
Floor mats ...........................................................22
Fluid Automatic transmission .......................... 320
Brake...................................................... 252, 321
Washer ........................................................... 254
Footwell light ...................................................215
Front passenger occupant classification system .............................................................. 36
Front position lights Wattage.......................................................... 326
Front seats Adjustment....................................................... 97
Cleaning......................................................... 235
Correct driving posture .............................23 Driving position memory ........................ 100
Head restraints............................................. 103
Memory recall function............................ 102
Power easy access system .................... 100
Seat heaters .................................................... 212
Seat position memory ..............................100
Seat ventilators .............................................. 212
Front side marker light Light switch .................................................... 136
Front turn signal lights Replacing light bulbs ................................270
Turn signal lever .......................................... 133
Wattage ..........................................................326
Fuel Capacity .......................................................... 318
Fuel gauge ........................................................ 66
Fuel pump shut off system...................... 281
Information .................................................... 327
Refueling.......................................................... 148
Type ................................................................... 318
Warning light .............................................. 286
Fuel consumption Average fuel economy .............................. 72
Current fuel consumption ........................ 72
Fuel filler door If the fuel filler door cannot be opened ....
303
Refueling.......................................................... 148
Fuel gauge ......................................................... 66
Fuel pump shut off system..........................281
Fuses ..................................................................267
G
Garage door opener ................................. 222
Gauges ............................................................... 66
Gear Position ................................................... 75
G-force................................................................74
Glove box ......................................................... 217
Glove box light ...............................................218

3791-1. What to do if... (Troubleshooting)
RC350AWD_RC350_RC300AWD_RC30
0_OM_(U)_1810379Alphabetical Index
Multi-information display .............................. 71 Audio system-linked display................... 75
Boost gauge.....................................................74
Drive information ...........................................72
Drive information 1/Drive information 2/Drive information 3..............................72
Driving assist system information display 76
Dynamic radar cruise control .............. 168
Eco Driving Indicator ..................................73
Engine oil pressure gauge ........................74
Engine oil temperature gauge ................74
Gear Position ................................................. 75
G-force...............................................................74
LDA (Lane Departure Alert with steering control) ..........................................................163
Menu icons .......................................................72
Meter control switches ...............................72
Navigation system-linked display ........ 75
Settings .............................................................. 76
Tire pressure ....................................... 75, 258
Units .................................................................... 75
Vehicle sway warning ................................ 75
Warning message display ....................... 76
Warning messages ..................................290
N
Navigation system-linked display.............75
Noise from under vehicle .............................. 5
O
“ODO TRIP” switch ...................................... 70
Odometer ......................................................... 70
Odometer and trip meter display “ODO TRIP” switch .................................... 70
Oil Engine oil ........................................................ 318
Front differential oil ..................................... 321
Rear differential oil ...................................... 321
Opener Fuel filler door............................................... 148 Hood ................................................................245
Trunk ...................................................................90
Outer foot lights Location ........................................................... 215
Outside rear view mirrors Adjustment ..................................................... 108
Folding.............................................................. 109
Linked mirror function when reversing ....
109
Mirror position memory ..........................100
Outside rear view mirror defoggers209
Outside temperature.................................... 66
Overheating .................................................. 309
P
Paddle shift switches ........................... 130, 131
Panic mode ....................................................... 84
Parking brake Operation ........................................................134
Parking brake engaged warning buzzer134
Warning light ...............................................284
Warning message .......................................134
Parking lights Light switch .................................................... 136
Replacing light bulbs ................................270
PCS (Pre-Collision System) Function ........................................................... 154
PCS OFF switch ......................................... 156
Warning light .............................................. 285
Warning message ..........................160, 290
Personal lights.................................................215
Power control unit coolant Preparing and checking before winter.....196
Power easy access system ....................... 100
Power outlet .................................................. 220
Power steering (Elect ric power steering
system) ............................................................192 Warning light ...............................................284
Power windows Door lock linked window operation ..... 111

3831-1. What to do if... (Troubleshooting)
RC350AWD_RC350_RC300AWD_RC30
0_OM_(U)_1810383Alphabetical Index
Wireless remote control............................. 91
Trunk light ............................................................ 91
Turn signal lights Replacing light bulbs................................ 270
Turn signal lever ...........................................133
Wattage.......................................................... 326
V
Vanity lights...................................................... 221
Vanity mirrors ................................................. 221
Variable Gear Ratio Steering (VGRS) 192
VDIM (Vehicle Dynami cs Integrated Man-
agement)........................................................193
Vehicle data recording .... ............................... 5
Vehicle Dynamics Integrated Manage- ment (VDIM)................................................193
Vehicle identification number ..................316
Vehicle Stability Control (VSC) .............192
Vehicle sway warning display ....................75
Ventilators (seat ventilators)..................... 212
VGRS (Variable Gear Ratio Steering) 192
VSC (Vehicle Stabilit y Control) .............192
W
Warning buzzer
Open door warning.................................285
Warning buzzers Approach warning...................................... 173
Brake Override System ......................... 284
Downshifting ......................................... 131, 132
Drive-Start Control .................................. 284
Electric power steering .......................... 284
High coolant temperature .................... 282
LDA (Lane Departure Alert with steering control) ........................................................... 161
LDA (Lane Departure Alert)...............285
Low engine oil pressure......................... 283
Open door..............................................87, 88
Open window .................................................. 111
Parking brake .............................................. 284
Pre-collision braking................................. 155 Seat belt ......................................................... 286
Warning lights............................................... 282 ABS ...................................................................283
Brake Override System .........................284
Brake system................................................282
Charging system........................................282
Drive-Start Control...................................284
Electric power steering...........................284
High coolant temperature.....................282
LDA indicator ............................................. 285
Low engine oil pressure.........................283
Low fuel level .............................................. 286
Malfunction indicator lamp ...................283
Master warning light................................. 287
Open door warning ................................ 285
Parking brake indicator ..........................284
Pre-collision system................................. 285
Seat belt reminder light.......................... 286
Slip indicator ................................................ 285
SRS ....................................................................283
Tire pressure ................................................ 287
Warning message display............................76
Warning messages ..................................... 290
Washer Checking .......................................................254
Preparing and checking before winter.....196
Switch.................................................................. 141
Washing and waxing.................................. 232
Weight Cargo capacity .............................................123
Load limits .......................................................123
Weight.............................................................. 316
Wheels ............................................................. 263 Size .................................................................... 322
Window lock switch ........................................111
Windows Power windows ............................................. 110
Rear window defogger.......................... 209
Washer .............................................................. 141
Windshield wiper de-icer ........................ 209
Windshield wipers ......................................... 141