radiator TOYOTA COROLLA HYBRID 2021 Owners Manual (in English)

4277-2. Maintenance
COROLLA HV_U
7
Maintenance and care
Engine oil
Is the engine oil at
the correct level?
(  P.434)
Exhaust sys-
temThere should not
be any fumes or
strange sounds.
Radiator/con-
denser
The radiator and
condenser should
be free from for-
eign objects.
( P.437)
Washer fluid
Is there sufficient
washer fluid?
( P.440)
Vehicle interior
ItemsCheck points
Accelerator
pedal
The accelerator
pedal should move
smoothly (without
uneven pedal effort
or catching).
Brake pedal
• Does the brake
pedal move
smoothly?
• Does the brake pedal have
appropriate
clearance from
the floor?
( P.528)
• Does the brake pedal have the
correct amount
of free play?
( P.528)
ItemsCheck points
Brakes
• The vehicle
should not pull to
one side when
the brakes are
applied.
• The brakes should work
effectively.
• The brake pedal should not feel
spongy.
• The brake pedal should not get
too close to the
floor when the
brakes are
applied.
Head
restraints
Do the head
restraints move
smoothly and lock
securely?
Hybrid trans-
mission “Park”
mechanism
When parked on a
slope and the shift
lever is in P, is the
vehicle securely
stopped?
Indica-
tors/buzzersDo the indicators
and buzzers func-
tion properly?
LightsDo all the lights
come on?
Parking brake
• Does the park-ing brake oper-
ate normally?
• When parked on a slope and the
parking brake is
on, is the vehicle
securely
stopped?
ItemsCheck points

4317-3. Do-it-yourself maintenance
COROLLA HV_U
7
Maintenance and care
Light bulbs
(  P.463)
• Bulb with same
number and wattage
rating as original
• Flathead screw- driver
•Wrench
Radiator
and con-
denser
(  P.437)

Tire infla-
tion pres-
sure
( P.450)• Tire pressure gauge
• Compressed air
source
Washer
fluid
( P.440)
• Water or washer
fluid containing anti-
freeze (for winter
use)
• Funnel (used only for adding water or
washer fluid)
WA R N I N G
The engine compartment contains
many mechanisms and fluids that
may move suddenly, become hot,
or become electrically energized.
To avoid death or serious injury,
observe the following precautions.
■When working on the engine
compartment
●Make sure that the “ACCES-
SORY” or “IGNITION ON” on
the multi-inform ation display
and the “READY” indicator are
both off.
●Keep hands, clothing and tools
away from the moving fans.
ItemsParts and tools●Be careful not to touch the
engine, power control unit, radi-
ator, exhaust manifold, etc. right
after driving as they may be hot.
Oil and other fluids may also be
hot.
●Do not leave anything that may
burn easily, such as paper and
rags, in the engine compart-
ment.
●Do not smoke, c ause sparks or
expose an open flame to fuel or
the 12-volt battery. Fuel and
12-volt battery fumes are flam-
mable.
●Be extremely cautious when
working on the 12-volt battery. It
contains poisonous and corro-
sive sulfuric acid.
■When working near the elec-
tric cooling fans or radiator
grille
Be sure the power switch is OFF.
With the power switch in ON, the
electric cooling fans may auto-
matically start to r un if the air con-
ditioning is on an d/or the coolant
temperature is high. ( P.437)
■Safety glasses
Wear safety glasses to prevent
flying or falling material, fluid
spray, etc. from getting in your
eyes.
NOTICE
■If you remove the air cleaner
filter
Driving with the ai r cleaner filter
removed may cause excessive
engine wear due to dirt in the air.

4347-3. Do-it-yourself maintenance
COROLLA HV_U
Washer fluid tank ( P.440)
Engine coolant reservoir ( P.436)
Fuse boxes ( P.461)
Engine oil level dipstick ( P.435)
Engine oil filler cap ( P.435)
Power control unit coolant reservoir ( P.436)
Brake fluid reservoir ( P.438)
12-volt battery ( P.439)
Radiator ( P.437)
Condenser ( P.437)
Electric cooling fans
With the engine at operating temperature and turned off,
check the oil level on the dip-
stick.
Engine compar tment
Components
Checking and adding the
engine oil

4377-3. Do-it-yourself maintenance
COROLLA HV_U
7
Maintenance and care
Reservoir cap
“FULL” line
“LOW” line
I f t he le ve l is on o r be low th e “L O W ”
line, add coolant up to the “FULL”
line. ( P.517)
■Coolant 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 mixture of 50% coolant and 50%
deionized water. (Minimum tem-
perature: -31°F [-35°C])
Canada:
“Toyota Super Long Life Coolant” is
a mixture of 55% coolant and 45%
deionized water. (Minimum tem-
perature: -44°F [-42°C])
For more details about coolant, con-
tact your Toyota dealer.
■If the coolant level drops within
a short time of replenishing
Visually check the radiator, hoses,
engine/power control unit coolant
reservoir caps, drain cock and water
pump.
If you cannot find a leak, have your
Toyota dealer test the cap and
check for leaks in the cooling sys-
tem.
Check the radiator and con-
denser and clear away any for-
eign 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 Toyota dealer.
WA R N I N G
■When the hybrid system is
hot
Do not remove the engine/power
control unit coolant reservoir
caps.
The cooling system may be under
pressure and may spray hot cool-
ant 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
B e s ur e to wa sh it o ff with w at er to
prevent it from damaging parts or
paint.
Checking the radiator and
condenser
WA R N I N G
■When the hybrid system is
hot
Do not touch the radiator or con-
denser as they may be hot and
cause serious injuries, such as
burns.

5188-2. Steps to take in an emergency
COROLLA HV_U
sides.
If you do not see steam:
Carefully lift the hood.
3 After the hybrid system has
cooled down sufficiently,
inspect the hoses and radia-
tor core (radiator) for any
leaks.
Radiator
Cooling fans
If a large amount of coolant leaks,
immediately cont act your Toyota
dealer.
4 The coolant level is satisfac-
tory if it is between the “MAX”
and “MIN” lines on the reser-
voir.
Reservoir
“MAX” line
“MIN” line
5 Add coolant if necessary.
Water can be used in an emer-
gency if coolant is unavailable.
6Start the hybrid system and
turn the air conditioning sys-
tem on to check that the radi-
ator cooling fans operate and
to check for coolant leaks
from the radiator or hoses.
The fans operate when the air con-
ditioning system is turned on imme-
diately after a cold start. Confirm
that the fans are operating by
c h e c k i n g t h e f a n s o u n d a n d a i r f l o w.
If it is difficult to check these, turn
the air conditioni ng system on and
off repeatedly. (The fans may not
operate in freezing temperatures.)
7 If the fans are not operating:
Stop the hybrid system
immediately and contact your
Toyota dealer.
If the fans are operating:
Have the vehicle inspected at
the nearest Toyota dealer.
If “Hybrid System Over-
heated Output Power
Reduced” is shown on the
multi-information display
1 Stop the vehicle in a safe
place.
2 Stop the hybrid system and
carefully lift the hood.

5198-2. Steps to take in an emergency
COROLLA HV_U
8
When trouble arises
3 After the hybrid system has
cooled down, inspect the
hoses and radiator core (radi-
ator) for any leaks.
Radiator
Cooling fans
If a large amount of coolant leaks,
immediately cont act your Toyota
dealer.
4 The coolant level is satisfac-
tory if it is between the
“FULL” and “LOW” lines on
the reservoir.
Reservoir
“FULL” line
“LOW” line
5 Add coolant if necessary.
Water can be used in an emer- gency if coolant is unavailable.
6
After stopping the hybrid sys-
tem and waiting for 5 minutes
or more, start the hybrid sys-
tem again and check for the
multi-information display.
If the message does not dis-
appear: Stop the hybrid sys-
tem and contact your Toyota
dealer.
If the message is not dis-
played: The hybrid system
temperature has dropped
and the vehicle may be
driven normally.
However, if the m essage appears
again frequently, contact your Toy-
ota dealer.
WA R N I N G
■When inspecting under the
hood of your vehicle
Observe the following precau-
tions. 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 sub-
sided. The engine compart-
ment may be very hot.

5208-2. Steps to take in an emergency
COROLLA HV_U
1Stop the hybrid system. Set
the parking brake and shift
the shift lever to P.
2 Remove the mud, snow or
sand from around the front
wheels.
3 Place wood, stones or some
other material under the front
wheels to help provide trac-
tion.
4 Restart the hybrid system.
5 Shift the shift lever to D or R
and release the parking
brake. Then, while exercising
caution, depress the acceler-
ator pedal.
■When it is difficult to free the
vehicle
Press the switch to turn off
TRAC.
WA R N I N G
●After the hybrid system has
been turned off, check that the
“READY” indicator is off. When
the hybrid system is operating,
the gasoline en gine may auto-
matically start, o r the cooling
fans may suddenly operate
even if the gasoline engine
stops. Do not touch or approach
rotating 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.
●Do not loosen the coolant reser-
voir caps while the hybrid sys-
tem and radiator are hot.
High temperature steam or
coolant could spray out.
NOTICE
■When adding engine/power
control unit coolant
Add coolant slowly after the
hybrid system has cooled down
sufficiently. Adding cool coolant to
a hot hybrid system too quickly
can cause damage to the hybrid
system.
■To prevent damage to the
cooling system
Observe the following precau-
tions:
●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 pro-
cedures if the tires spin or
the vehicle becomes stuck
in mud, dirt or snow:
Recovering procedure

575Alphabetical Index
COROLLA HV_U
Personal lights ....................... 395 Wattage ................................ 530
Phone ...................................... 343 About the contacts in the contact list ....................................... 347
Phone screen operation ....... 343
Registering/Conn ecting a Blue-
tooth
® phone ...................... 345
Some basics......................... 344
Troubleshooting.................... 368
Voice command system ....... 347
When selling or disposing of the vehicle ................................ 347
Phone button .......................... 343
Phone button (Menu screen) . 255
Phone button (Setup screen) 258
Phone settings ....................... 358 Contacts/Call history settings360
Message settings ................. 366
Notifications settings ............ 359
Sounds settings.................... 358
Placing a call u sing the Blue-
tooth
® hands-free system ... 348
By call history ....................... 348
By contacts list ..................... 349
By favorites list ..................... 348
By home screen ................... 350
By keypad ............................ 350
Power control unit .................... 83
Power control unit coolant Capacity ............................... 527
Checking .............................. 436
Preparing and c hecking before
winter.................................. 247
Power outlet ............................ 402
Power steering (Electric power steering system)................... 240Warning light ........................ 481
Power switch .......................... 157 Auto power off function ........ 160
Changing the power switch modes ................................ 160 Power switch (engine switch)
If your vehicle has to be stopped in an emergency .................471
POWER VOLUME knob ..........299
Power windows Door lock linked window opera-tion......................................143
Jam protection function ........142
Operation..............................142
Window lock switch ..............144
Pre-Collision System (PCS) Function................................189
Warning light.........................483
R
Radar cruise control (dynamic radar cruise control with
full-speed range)...................207
Radiator ...................................437
Radio........................................303 Displaying the radi o ID .........306
How to subscribe to SiriusXM Radio Services ...................305
Presetting a station ...............303
Radio broadcast data system304
Refer to the tabl e below to iden-
tify the problem and take the
suggested corrective action 306
RCTA Function................................226
Warning message.................227
RCTA function .........................228
Rear Cross Traffic Alert (RCTA) ...............................................226
Rear seats ...............................134 Head restraints .....................136
Rear side marker lights Light switch...........................173
Replacing light bulbs ....464, 465
Wattage ................................530
Rear turn signal lights Replacing light bulbs ............465