2022 LEXUS ES300h radiator cap

3236-3. Do-it-yourself maintenance
6
Maintenance and care
Fuse boxes (P.349)
Engine oil filler cap ( P.324)
Engine oil level dipstick ( P.323)
Brake fluid reservoir ( P.327)
Radiator ( P.326)
Electric cooling fan
Condenser ( P.326)
Power control unit coolant reservoir ( P.326)
Engine coolant reservoir ( P.325)
Washer fluid tank ( P.327)
Q12-volt battery
 P.328
With the engine at operating tempera-
ture and turned off, check the oil level
Engine compartment
Components
A
B
C
D
E
F
G
H
I
J
Checking and adding the engine
oil

3266-3. Do-it-yourself maintenance
Reservoir cap
“F” line
“L” line
If the level is on or below the “L” line, add
coolant up to the “F” line. (P.396)
QPower control unit coolant reser-
voir
Reservoir cap
“FULL” line
“LOW” line
If the level is on or below the “LOW” line,
add coolant up to the “FULL” line.
(  P.397)
QCoolant selection
Only use “Toyota Super Long Life Coolant”
or a similar high quality ethylene glycol
based non-silicate, non-amine, non-nitrite,
and non-borate coolant with long-life
hybrid organic acid technology.
U.S.A.:
“Toyota Super Long Life Coolant” is a mix-
ture of 50% coolant and 50% deionized
water. (Minimum temperature: -31°F [-
35°C])
Canada:
“Toyota Super Long Life Coolant” is a mix-
ture of 55% coolant and 45% deionized
water. (Minimum temperature: -44°F [-
42°C])
For more details about coolant, contact
your Lexus dealer.
QIf the coolant level drops within a short
time of replenishing
Visually check the radiator, hoses,
engine/power control unit coolant reser-
voir caps, drain cock and water pump.
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.
A
B
C
A
B
C
WARNING
QWhen the hybrid system is hot
Do not remove the engine/power con-
trol unit coolant reservoir caps or the
radiator cap. ( P.398)
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
QWhen 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.
QIf you spill coolant
Be sure to wash it off with water to pre-
vent it from damaging parts or paint.
Checking the radiator and con-
denser

3967-2. Steps to take in an emergency
If the engine coolant temperature
gauge enters the red zone or
“Engine Coolant Temp High Stop in
a Safe Place See Owner’s Manual”
is shown on the multi-information
display
1 Stop the vehicle in a safe place and
turn off the air conditioning system,
and then stop the hybrid system.
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 hybrid system has cooled
down sufficiently, inspect the hoses
and cooling system for leaks.
If a large amount of coolant leaks, immedi-
ately contact your Lexus dealer.
Radiator
Cooling fan
4 The coolant level is satisfactory if it
is between the “F” and “L” lines on
the reservoir.
Reservoir
“F” line
“L” line
Coolant inlet cap
5 Add coolant if necessary.
Water can be used in an emergency if
engine coolant is unavailable.
If water was added in an emergency, have
the vehicle inspected at your Lexus dealer
If your vehi cle overheats
The following may indicate that
your vehicle is overheating.
The engine coolant temperature
gauge ( P.76, 80) is in the red
zone or a loss of hybrid system
power is experienced. (For exam-
ple, the vehicle speed does not
increase.)
 “Engine Coolant Temp High Stop
in a Safe Place See Owner’s
Manual” or “Hybrid system over-
heated Output power reduced” is
shown on the multi-information
display.
 Steam comes out from under the
hood.
Correction procedures
A
B
A
B
C
D

3987-2. Steps to take in an emergency
as soon as possible.
6After stopping the hybrid system
and waiting for 5 minutes or more,
start the hybrid system again and
check if “Hybrid system over-
heated Output power reduced” is
shown on the multi-information dis-
play.
If the message does not disappear:
Stop the hybrid system and contact your
Lexus dealer.
If the message is not displayed:
The hybrid system temperature has
dropped and the vehicle may be driven
normally.
However, if the message appears again
frequently, contact your Lexus dealer.
WARNING
QWhen inspecting under the hood of
your vehicle
Observe the following precautions.
Failure to do so may result in serious
injury such as burns.
OIf 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.
OAfter the hybrid system has been
turned off, check that the “READY”
indicator are off.
When the hybrid system is operating,
the gasoline engine may automatically
start, or the cooling fan may suddenly
operate even if the gasoline engine
stops. Do not touch or approach rotat-
ing parts such as the fan, which may
lead to fingers or clothing (especially a
tie, a scarf or a muffler) getting caught,
resulting in serious injury.
ODo not loosen the coolant inlet cap or
coolant reservoir caps while the hybrid
system and radiator are hot.
High temperature steam or coolant
could spray out.
NOTICE
QWhen adding engine/power control
unit coolant
Add coolant slowly after the hybrid sys-
tem has cooled down sufficiently. Adding
cool coolant to a hot hybrid system too
quickly can cause damage to the hybrid
system.
QTo prevent damage to the cooling
system
Observe the following precautions:
OAvoid contaminating the coolant with
foreign matter (such as sand or dust
etc.).
ODo not use any coolant additive.

458Alphabetical index
RCTA function ............................................ 230
Outside temperature............................76, 80
Overheating .................................................. 396
P
Paddle shift switches ..........................156, 157
Panic mode ......................................................102
Parking assist sensors (intuitive parking assist) ............................................................. 222
Parking brake..................................................159 Operation....................................................... 159
Parking brake engaged warning buzzer.......................................................................... 160
Warning light ............................................... 370
Warning message...................................... 160
Parking lights ...................................................163 Light switch.....................................................163
Parking Support Brake function (rear- crossing vehicles) .......................... 239, 249 Function .......................................................... 249
Parking Support Brake function (rear pedestrians) ...................................... 239, 251 Function ............................................................251
Parking Support Brake function (static objects) .............................................. 239, 246 Function .......................................................... 246
PCS (Pre-Collision System) .....................182 Function ............................................................182
PCS OFF switch ......................................... 185
Warning light ............................................... 370
Personal lights............................................... 282
PKSA (Parking Support Alert) ................ 221
PKSB (Parking Support Brake)............. 239 Warning message..................................... 244
Power control unit.......................................... 62
Power control unit coolant ...................... 325 Capacity .........................................................405
Checking ....................................................... 325
Preparing and checking before winter.........................................................................260
Power easy access system ......................... 121
Power outlet .................................................. 289 Power steering (Electric power steering
system) .......................................................... 253 Warning light .............................................. 366
Power switch .................................................. 148 Auto power off function........................... 152
Changing the power switch modes ... 151
If your vehicle has to be stopped in an emergency................................................ 358
Starting the hybrid system ...................... 148
Power trunk lid .............................................. 108
Power windows ............................................... 131 Door lock linked window operation ..132
Jam protection function ............................. 131
Operation ......................................................... 131
Window lock switch...................................132
Pre-Collision System (PCS) .....................182 Function ........................................................... 182
PCS OFF switch ......................................... 185
Warning light ...............................................370
R
Radar cruise control (dynamic radar cruise control with full-speed range)............. 204
Radiator ........................................................... 326
RCD (Rear Camera Detection) ........... 236 Function ..........................................................236
Warning message ..................................... 237
RCTA (Rear Cross Traffic Alert) ......... 230
RCTA Function ..........................................................230
Warning message .......................................231
Rear Cross Traffic Alert (RCTA) ......... 230
Rear door sunshades ................................. 296
Rear seats Head restraints..............................................124
Rear side marker lights ...............................163 Light switch .................................................... 163
Replacing light bulbs................................352
Rear sunshades ............................................ 295
Rear turn signal lights ................................. 158 Replacing light bulbs................................352
Turn signal lever .......................................... 158