2022 LEXUS RC300 radiator

3227-2. Steps to take in an emergency
RC350/RC300 Owner's Manual
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 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.

3237-2. Steps to take in an emergency
RC350/RC300 Owner's Manual
7
When trouble arises
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
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.

391Alphabetical Index
RC350/RC300 Owner's Manual
Power control unit coolantPreparing and checking before winter......................................................................... 203
Power easy access system ....................... 100
Power outlet .................................................. 228
Power steering (Elect ric power steering
system)............................................................199 Warning light ............................................... 295
Power windows Door lock linked window operation..... 111
Jam protection function............................. 110
Operation......................................................... 110
Window lock switch ..................................... 111
Pre-Collision System (PCS) Function ........................................................... 160
PCS OFF switch ..........................................162
Warning light ............................................... 296
Warning message...................................... 301
R
Radar cruise control (dynamic radar cruise control with full-speed range)............... 174
Radiator ........................................................... 260
RCTA Function ........................................................... 189
Rear Cross Traffic Alert (RCTA) .......... 189
Rear seats .......................................................... 99 Head restraints ............................................ 103
Seat heaters .................................................... 221
Seat ventilators.............................................. 221
Rear side marker lights Light switch .................................................... 140
Rear turn signal lights Turn signal lever ...........................................134
Wattage.......................................................... 336
Rear view mirror Inside rear view mirror..............................107
Outside rear view mirrors ..................... 108
Rear window defogger ............................... 217
Refueling Capacity ......................................................... 328
Fuel types....................................................... 328 If the fuel filler do
or cannot be opened
............................................................................314
Opening the fuel tank cap ..................... 153
Remote Touch ..............................................208
Replacing Electronic key battery .............................. 275
Fuses................................................................. 276
Light bulbs ..................................................... 279
Tires ................................................................. 305
Resetting the message indicating mainte- nance is required ...................................... 246
Rev indicator .................................................... 68
Rev peak............................................................. 69
S
Seat belt reminder light............................. 297
Seat belts............................................................ 24 Automatic Locking Retractor................. 26
Child restraint system installation ..40, 41
Cleaning and maintaining the seat belt.......................................................................... 243
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 ................... 297
Seat belt extender......................................... 25
Seat belt pretensioners .............................. 27
SRS warning light....................................... 294
Seat heaters ..................................................... 221
Seat position memory................................. 100
Seat ventilators ............................................... 221
Seating capacity.............................................123
Seats Adjustment ....................................................... 97
Cleaning ......................................................... 243
Driving position memory ........................ 100
Head restraints............................................. 103
Power easy access system .................... 100
Properly sitting in the seat ........................ 23