2021 LEXUS RCF radiator cap

2676-4. Do-it-yourself maintenance
6
Maintenance and care
Fuse boxes (P.285)
Battery ( P.271)
Engine oil level dipstick ( P.267)
Engine coolant reservoir ( P.269)
Engine oil filler cap ( P.267)
Brake fluid reservoir ( P.270)
Washer fluid tank ( P.272)
Electric cooling fans
Condenser ( P.270)
Radiator ( P.270)
With the engine at operating tempera-
ture and turned off, check the oil level on the dipstick.
■Checking the engine oil
1 Park the vehicle on level ground.
After warming up the engine and
turning it off, wait more than 5 min-
Engine compartment
Components
A
B
C
D
E
F
G
H
I
J
Checking and adding the engine
oil

2706-4. Do-it-yourself maintenance
If you cannot find a leak, have your Lexus
dealer test the cap and check for leaks in
the cooling system.
Check the radiator and condenser and
clear away any foreign objects.
If either of the above parts is extremely
dirty or you are not sure of their condi-
tion, have your vehicle inspected by
your Lexus dealer.
■Checking fluid level
The brake fluid level should be
between the “MAX” and “MIN” lines
on the tank.
■Adding fluid
Make sure to check the fluid type and
prepare the necessary item.
 Fluid type
SAE J1703 or FMVSS No.116 DOT 3
brake fluid
SAE J1704 or FMVSS No.116 DOT 4
brake fluid
Item
Clean funnel
■Brake fluid can absorb moisture from
the air
Excess moisture in the brake fluid can cause
a dangerous loss of braking efficiency. Use
only newly opened brake fluid.
WARNING
■When the engine is hot
Do not remove the engine coolant reser-
voir cap. ( P.338)
The cooling system may be under pres-
sure and may spray hot coolant if the cap
is removed, causing serious injuries, such
as burns.
NOTICE
■When adding coolant
Coolant is neither plain water nor
straight antifreeze. The correct mixture
of water and antifreeze must be used to
provide proper lubrication, corrosion
protection and cooling. Be sure to read
the antifreeze or coolant label.
■If you spill coolant
Be sure to wash it off with water to pre-
vent it from damagi ng parts or paint.
Checking the radiator and con-
denser
WARNING
■When the engine is hot
Do not touch the radiator or condenser
as they may be hot and cause serious
injuries, such as burns.
Checking and adding the brake
fluid

3387-2. Steps to take in an emergency
radiator core (radiator) for any
leaks.
Cooling fans
Radiator
If a large amount of coolant leaks, immedi-
ately contact your Lexus dealer.
4The 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 coolant is unavailable.
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.)
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.
A
B
A
B
C
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.

3397-2. Steps to take in an emergency
7
When trouble arises
1Stop the engine. Set the parking
brake and shift the shift lever to P.
2 Remove the mud, snow or sand
from around the rear wheels.
3 Place wood, stones or some other
material under the rear wheels to
help provide traction.
4 Restart the engine.
5 Shift the shift lever to D or R and
release the parking brake. Then,
while exercising caution, depress
the accelerator pedal.
■When it is difficult to free the vehicle
Press the switch to turn off TRAC.
WARNING
●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.
●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.
If the vehicle becomes stuck
Carry out the following proce-
dures if the tires spin or the vehicle
becomes stuck in mud, dirt or snow:
Recovering procedure

400Alphabetical Index
PCS warning light .................................... 305
R
Radar cruise control (dynamic radar cruise control) ............................................................ 171
Radiator ........................................................... 270
RCTA Function ............................................................ 179
Rear Cross Traffic Alert (RCTA) ........... 179
Rear passengers’ seat belt reminder lights .......................................................................... 307
Rear seats Seat heaters .................................................... 221
Seat ventilators.............................................. 221
Rear side marker lights Light switch .................................................... 138
Rear turn signal lights Replacing light bulbs................................289
Turn signal lever ...........................................136
Wattage..........................................................348
Rear view mirror Inside rear view mirror............................. 109
Outside rear view mirrors ....................... 110
Rear window defogger ............................... 217
Refueling Capacity ......................................................... 343
Fuel types....................................................... 343
If the fuel filler door cannot be opened...........................................................................331
Opening the fuel tank cap ..................... 150
Remote Touch ..............................................208
Replacing Electronic key battery.............................. 283
Fuses ................................................................285
Light bulbs.....................................................288
Tires ....................................................................313
Resetting the message indicating mainte- nance is required ...................................... 257
Rev indicator .................................................... 70
Rev peak............................................................... 71
S
Seat belt reminder light................. 306, 307
Seat belts............................................................ 24 Automatic Locking Retractor................. 26
Child restraint system installation ......... 43
Cleaning and maintaining the seat belt..........................................................................245
Driver’s and front passenger’s seat belt reminder light and buzzer ................ 306
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
Rear passengers’ seat belt reminder lights and buzzer ....................................307
Seat belt extender......................................... 25
Seat belt pretensioners .............................. 27
SRS warning light...................................... 303
Seat heaters ..................................................... 221
Seat position memory................................. 105
Seat ventilators ............................................... 221
Seating capacity.............................................126
Seats Adjustment ..................................................... 103
Child seats/child restraint system installa-tion .................................................................... 42
Cleaning .........................................................245
Driving position memory ........................ 105
Power easy access system .................... 105
Properly sitting in the seat ........................ 23
Seat heaters .................................................... 221
Seat position memory .............................. 105
Seat ventilators .............................................. 221
Sensor Automatic headlight system .................. 138
Automatic High Beam system ............. 140
Inside rear view mirror ............................... 110
LDA (Lane Departure Alert with steering control) ......................................................... 164