coolant reservoir TOYOTA COROLLA HYBRID 2021 Owners Manual (in English)

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

4367-3. Do-it-yourself maintenance
COROLLA HV_Ution may increase, and engine oil
may need to be refilled in between
oil maintenance intervals.
●When the engine is new, for
example directly after purchasing
the vehicle or after replacing the
engine
●If low quality oil or oil of an inap-
propriate viscosity is used
●When driving at high engine
speeds or with a
heavy load, or
when driving while accelerating or
decelerating frequently
●When leaving the engine idling for
a long time, or wh en driving fre-
quently through heavy traffic
■Engine coolant reservoir
The coolant level is satisfactory
if it is between the “MAX” and
“MIN” lines on the reservoir
when the engine is cold.
Reservoir cap
“MAX” line
“MIN” line
If the level is on or below the “MIN”
line, add coolant up to the “MAX”
line. ( P.517)
■Power control unit coolant
reservoir
The coolant level is satisfactory
if it is between the “FULL” and
“LOW” lines on the reservoir
when the hybrid system is cold.
WA R N I N G
■Used engine oil
●Used engine oil contains poten-
tially harmful contaminants
which may cause skin disorders
such as inflammation and skin
cancer, so care should be taken
to avoid prolonged and
repeated contact. To remove
used engine oil from your skin,
wash thoroughly with soap and
water.
●Dispose of used oil and filters
only in a safe an d acceptable
manner. Do not dispose of used
oil and filters in household trash,
in sewers or onto the ground.
Call your Toyota dealer, service
station or auto parts store for
information concerning recy-
cling or disposal.
●Do not leave used engine oil
within the rea ch of children.
NOTICE
■To prevent serious engine
damage
Check the oil level on a regular
basis.
■When replacing the engine oil
●Be careful not to spill engine oil
on the vehicle components.
●Avoid overfilling, or the engine
could be damaged.
●Check the oil level on the dip-
stick every time you refill the
vehicle.
●Be sure the engin e oil filler cap
is properly tightened.
Checking the coolant

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.