2019 LEXUS RC350 engine coolant

2937-2. Steps to take in an emergency
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When trouble arises
tenance” or “Owner’s Manual Supple-
ment” for the maintenance interval
applicable to your vehicle.
■If “Oil Maintenance Required Soon” is
displayed
Indicates that the engine oil is scheduled to
be changed. (The indicator will not work
properly unless the oil maintenance data
has been reset.)
Check the engine oil, and change if neces-
sary. After changing the engine oil, the oil
change system shou ld be reset. (P.250)
■If “Oil Maintenance Required” is dis-
played
Indicates that the engine oil should be
changed. (After the engine oil is changed
and the oil maintenance data has been
reset.)
Check and change the en gine oil, and oil fil-
ter by your Lexus deal er. After changing the
engine oil, the oil change system should be
reset. ( P.250)
■If a message that indicates the need for
visiting your Lexus dealer is displayed
The system or part shown on the
multi-information display is malfunctioning.
Have the vehicle inspected by your Lexus
dealer immediately.
■If “See Owner’s Manual” is displayed
●If the following messages are shown, fol-
lowing the instructions, accordingly.
• “Engine Coolant Temp High” ( P.309)
●If any of the following messages are
shown on the multi-information display, it
may indicate a malfunction. Have the
vehicle inspected by your Lexus dealer
immediately.
• “Braking Power Low”
• “Access System with Elec. Key Malfunc- tion”
●If any of the following messages are
shown on the multi-information display, it
may indicate a malfunction. Immediately
stop the vehicle and contact your Lexus
dealer.
• “Oil Pressure Low”
• “Charging System Malfunction” NOTICE
■“High Power Consumption Partial
Limit On AC/Heater Operation” is
frequently shown
There is a possible malfunction relating
to the charging system or the battery
may be deteriorating. Have the vehicle
inspected by your Lexus dealer.

3097-2. Steps to take in an emergency
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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

3107-2. Steps to take in an emergency
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Radiator
Cooling fans
If a large amount of coolant leaks, immedi-
ately contact your Lexus dealer.
RC300
Radiator
Cooling fans
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” or “F”)
and low (“LOW” or “L”) lines on the
reservoir.
 Engine (RC350/RC300 AWD) Reservoir cap
“FULL” or “F”
“LOW” or “L”
 Engine (RC300)
Reservoir cap
“FULL” or “F”
“LOW” or “L”
 Intercooler (RC300)
Reservoir cap
“FULL” or “F”
“LOW” or “L”
A
B
A
B
A
B
C
A
B
C
A
B
C

3117-2. Steps to take in an emergency
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When trouble arises
5Add coolant if necessary.
Water can be used in an emergency if
coolant is unavailable.
 Engine (RC350/RC300 AWD)
 Engine (RC300)
 Intercooler (RC300)
6
Start 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 oper
ate in freezing tem-
peratures.)
7If 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 muffler) away from the
fans and belts. Failure to do so may
cause the hands or clothing to be
caught, resulting in serious injury.

3127-2. Steps to take in an emergency
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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
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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
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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

3751-1. What to do if... (Troubleshooting)
RC350AWD_RC350_RC300AWD_RC30
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Doors Automatic door lock ing and unlocking
system .............................................................88
Door glasses ................................................... 110
Door lock.......................................................... 86
Open door warning buzzer87, 88, 285
Open door warning light ......................285
Outside rear view mirrors ..................... 108
Drive distance ...................................................72
Drive info 1/Drive info 2/Drive info 3.....72
Drive information ............................................72
Driver’s seat position memory Driving position memory........................ 100
Memory recall function ............................102
Power easy access system .................... 100
Drive-start control ......................................... 117
Driving Break-in tips .....................................................117
Correct driving posture .............................23
Driving mode select switch ................... 190
Procedures ...................................................... 116
Winter drive tips...........................................196
Driving assist system information display.... 76
Driving information display .........................72
Driving position memory........................... 100 Memory recall function ............................102
Power easy access system .................... 100
Driving range ....................................................72
DRS (Dynamic Rear Steering) ................192
Dynamic radar cruise control ................. 168 Warning message.......................... 175, 290
Dynamic Rear Steering (DRS) ................192
E
Eco Driving Indicator.....................................73
Eco Driving Indicator Light .........................73
EDR (Event data recorder) ............................6
Elapsed time ......................................................72
Electric Power Steering (EPS) ................192 Warning light ............................................... 284 Electronic key .................................................. 82
Battery-saving function.............................. 94
If the electronic key does not operate properly ...................................................... 304
Replacing the battery ...............................265
Emergency flashers .....................................274
Emergency, in case of If a warning buzzer sounds...................282
If a warning light turns on.......................282
If a warning message is displayed .... 290
If the battery is discharged ................... 306
If the electronic key does not operate properly ...................................................... 304
If the engine will not start......................... 301
If the fuel filler door cannot be opened ....
303
If the vehicle is trapped in rising water...... 275
If you have a flat tire .................................. 294
If you lose your keys ................................ 303
If you think something is wrong......... 280
If your vehicle becomes stuck .............. 313
If your vehicle has to be stopped in an emergency ................................................. 274
If your vehicle needs to be towed ..... 277
If your vehicle overheats ....................... 309
Engine ACCESSORY mode................................126
Compartment.............................................. 247
Engine switch ................................................ 125
Fuel pump shut off system...................... 281
Hood ................................................................245
How to start the engine ........................... 125
Identification number .................................317
If the engine will not start......................... 301
If your vehicle has to be stopped in an emergency ................................................. 274
Ignition switch (engine switch)............. 125
Overheating ................................................ 309
Tachometer ..................................................... 66
Engine coolant Capacity .......................................................... 319