coolant TOYOTA BZ4X 2022 Owners Manual (in English)

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5-1. Before driving
Driving
is especially true when driving on
wet or slippery road surfaces.
■Sudden acceleration/steering
input/cornering
Executing sharp turns when towing
may result in the trailer colliding
with your vehicle. Decelerate well in
advance when approaching turns
and take them slowly and carefully
to avoid sudden braking.
■Important points regarding
turning
The wheels of the trailer will travel
closer to the inside of the curve
than the wheels of the vehicle. To
make allowance for this, take the
turns wider than you would nor-
mally do.
■Important points regarding
stability
Vehicle movement resulting from
uneven road surfaces and strong
crosswinds will affect handling. The
vehicle may also be rocked by
passing buses or large trucks. Fre-
quently check behind when moving
alongside such vehicles. As soon
as such vehicle movement occurs,
immediately start to decelerate
smoothly by slowly applying the
brakes. Always steer the vehicle
straight ahead while braking.
■Passing other vehicles
Consider the total combined length
of your vehicle and trailer and
ensure that the vehicle-to-vehicle
distance is sufficient before execut-
ing lane changes.
■If the EV system overheats
Towing a loaded trailer up a long,
steep incline in temperatures
exceeding 30°C (85°F) may result
in the EV system overheating. If the
EV system coolant temperature
gauge indicates that the EV system
is overheating, turn the air condi-
tioning off immediately, leave the
road and stop the vehicle in a safe
place. ( P.549)
■When parking the vehicle
Always place wheel chocks under
the wheels of both the vehicle and
trailer. Firmly set the parking brake
and shift the shift position to P.
WARNING
F o l l o w a l l t h e i n s t r u c t i o n s d e s c r i b e d i n this section. Failure to do so could cause an accident resulting in death
or serious injury.
■Trailer towing precautions
When towing, make sure that none of the weight limits are exceeded. ( P.554)
■Vehicle speed in towing
Observe the legal maximum speeds
for trailer towing.
■Before descending hills or long
declines
Reduce speed and downshift. How- ever, never downshift suddenly while
descending steep or long downhill grades.

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5-5. Driving tips
Driving
5-5.Driving tips
Use fluids that are appropriate to
the prevailing outside tempera-
tures.
• Power control unit coolant
• Heater coolant
• Washer fluid
 Have a service technician
inspect the condition of the 12-
volt battery.
 Have the vehicle fitted with four
snow tires or purchase a set of
tire chains for the front tires.
Ensure that all tires are the same size
and brand, and that chains match the
size of the tires.
Perform the following according to
Winter driving tips
Carry out the necessary prepa-
rations and inspections before
driving the vehicle in winter.
Always drive the vehicle in a
manner appropriate to the pre-
vailing weather conditions.
Preparation for winter
WARNING
■Driving with snow tires
Observe the following precautions to
reduce the risk of accidents. Failure to do so may result in a loss of vehicle control and cause death or
serious injury.
●Use tires of the specified size.
●Maintain the recommended level of air pressure.
●Do not drive at speeds in excess of the speed limit or the speed limit specified for the snow tires being
used.
●Use snow tires on all, not just some
wheels.
■Driving with tire chains
Observe the following precautions to reduce the risk of accidents.Failure to do so may result in the vehi-
cle being unable to be driven safely, and may cause death or serious injury.
●Do not drive in excess of the speed limit specified for the tire chains being used, or 50 km/h (30 mph),
whichever is lower.
●Avoid driving on bumpy road sur-
faces or over potholes.
●Avoid sudden acceleration, abrupt
steering, sudden braking and shift- ing operations that cause sudden regenerative braking.
●Slow down sufficiently before enter-ing a curve to ensure that vehicle
control is maintained.
●Do not use LTA (Lane Tracing
Assist).
NOTICE
■Repairing or replacing snow tires
Request repairs or replacement of
snow tires from any authorized Toyota retailer or Toyota authorized repairer, or any reliable repairer or legitimate
tire retailers. This is because the removal and attachment of snow tires affects the
operation of the tire pressure warning valves and transmitters.
Before driving the vehicle

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7-3. Do-it-yourself maintenance
Maintenance and care
7-3.Do-it-y ours elf main ten ance
Do-it-yourself ser vice
precautions
If you perform maintenance by
yourself, be sure to follow the
correct procedure as given in
these sections.
Maintenance
ItemsParts and tools
12-volt battery
condition
( P.473)
•Warm water
• Baking soda
•Grease
• Conventional
wrench (for terminal
clamp bolts)
• Distilled water
Heater coolant
level
( P.470, 472)
• “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 technol-
ogy
“Toyota Super Long
Life Coolant” is pre-
mixed with 50%
coolant and 50%
deionized water.
• Funnel (used only
for adding coolant)
Power control
unit coolant
level
( P.472)
• In order to ensure
maximum perfor-
mance of the trac-
tion battery cooling
system and limit
risks of battery
short-circuit and
other damage to
your vehicle, Toyota
recommends using
“Toyota Genuine
Traction Battery
Coolant” or similar
high-quality ethylene
glycol-based, low
electric conductivity
coolant, non-amine
and non-borate cool-
ant with azole addi-
tives.
• Funnel (used only
for adding coolant)
Fuses
( P.501)
• Fuse with same
amperage rating as
original
Radiator and
condenser
( P.471)
−
Tire inflation
pressure
( P.494)
• Tire pressure gauge
• Compressed air
source
Washer fluid
( P.475)
• Water or washer
fluid containing anti-
freeze (for winter
use)
• Funnel (used only
for adding water or
washer fluid)
ItemsParts and tools

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7-3. Do-it-yourself maintenance
WARNING
The motor 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 motor com-
partment
●Make sure that “POWER ON” on the multi-information display and
the “READY” indicator are both off.
●Keep hands, clothing and tools
away from the moving fan.
●Be careful not to touch the motor,
power control unit, radiator, etc., right after driving as they may be hot. Coolant and other fluids may
also be hot.
●Do not leave anything that may
burn easily, such as paper and rags, in the motor compartment.
●Do not smoke, cause sparks or expose an open flame to the 12-volt battery. 12-volt battery fumes are
flammable.
●Be extremely cautious when work-
ing on the 12-volt battery. It con- tains poisonous and corrosive sulfuric acid.
●Never touch, disassemble, remove or replace the high voltage parts,
cables and their connectors. It can cause severe burns or electric shock that may result in death or
serious injury.
●Take care because brake fluid can
harm your hands or eyes and dam- age painted surfaces. If fluid gets on your hands or in your eyes, flush
the affected area with clean water immediately. If you still experience discomfort, consult a doctor.
■When working near the electric cooling fan or radiator grille
Be sure the power switch is OFF.
With the power switch in ON, the electric cooling fan may automatically start to run if the air conditioning is on
and/or the coolant temperature is high. ( P.471)
■Safety glasses
Wear safety glasses to prevent flying or falling material, fluid spray, etc.,
from getting in your eyes.
NOTICE
■If the fluid level is low or high
It is normal for the brake fluid level to
go down slightly as the brake pads wear or when the fluid level in the accumulator is high.
If the reservoir needs frequent refill- ing, it may indicate a serious problem.

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7-3. Do-it-yourself maintenance
Heater coolant reservoir (P.470)
Washer fluid tank ( P.475)
Power control unit coolant reservoir ( P.472)
12-volt battery ( P.473)
Fuse box ( P.501)
Radiator ( P.471)
Condenser ( P.471)
Electric cooling fan
The coolant level is satisfactory if it
is between the “MAX” and “MIN”
lines on the reservoir when the EV
system is cold.
Motor compartment
Components
Checking the heater coolant

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7-3. Do-it-yourself maintenance
Maintenance and care
Reservoir cap
“MAX” line
“MIN” line
If the level is on or below the “MIN” line,
add coolant up to the “MAX” line.
( P.549)
■Coolant selection
Only use “Toyota Super Long Life Cool- ant” 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.
“Toyota Super Long Life Coolant” is a mixture of 50% coolant and 50% deion-
ized water. (Minimum temperature: -35°C [-31°F])
For more details about coolant, contact
any authorized Toyota retailer or Toyota authorized repairer, or any reliable repairer.
■If the coolant level drops within a
short time of replenishing
Visually check the radiator, hoses, power control unit coolant reservoir
caps, drain cock and water pump.
If you cannot find a leak, have any authorized Toyota retailer or Toyota
authorized repairer, or any reliable repairer, 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 condition, have your vehicle
inspected by any authorized Toyota
retailer or Toyota authorized
repairer, or any reliable repairer.
WARNING
■When the EV system is hot
Do not remove the power control unit
coolant reservoir caps.
The cooling system may be under pressure 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 mix-
ture 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 prevent it from damaging parts or paint.
Checking the radiator and
condenser
WARNING
■When the EV system is hot
Do not touch the radiator or con-
denser as they may be hot and cause serious injuries, such as burns.

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7-3. Do-it-yourself maintenance
The coolant level is satisfactory if it
is between the “MAX” and “MIN”
lines on the reservoir when the EV
system 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.
■Coolant selection
In order to ensure maximum perfor-
mance of the traction battery cooling system and limit risks of battery short-circuit and other damage to your vehi-
cle, Toyota recommends using “Toyota Genuine Traction Battery Coolant” or
similar high-quality ethylene glycol-
based, low electric conductivity coolant, non-amine and non-borate coolant with azole additives.
Toyota cannot guarantee that the use of a product other than “Toyota Genuine Traction Battery Coolant” will prevent
risks of battery short-circuit or other damage.
Never use water as it will cause dam-
age.
Do not reuse coolant that has been removed from the radiator.
For more details about coolant, contact any authorized Toyota retailer or Toyota authorized repairer, or any reliable
repairer.
■If the coolant level drops within a short time of replenishing
Visually check the hoses, heater coolant
reservoir caps, drain cock and water pump.
If you cannot find a leak, have any
authorized Toyota retailer or Toyota authorized repairer, or any reliable repairer, test the cap and check for leaks
in the cooling system.
WARNING
■When the electric cooling fan is operating
Do not touch the motor compartment.
With the power switch in ON, the electric cooling fan may automatically
start to run if the air conditioning is on and/or the coolant temperature is high. Be sure the power switch is OFF
when working near the electric cool- ing fan or radiator grille.
Checking the power control
unit coolant
WARNING
■When the heater system is hot
Do not remove the heater coolant res-
ervoir caps.
The heater system may be under pressure and may spray hot coolant if
the cap is removed, causing serious injuries, such as burns.

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7-3. Do-it-yourself maintenance
Maintenance and care
Check the 12-volt battery as fol-
lows.
■12-volt battery exterior
Make sure that the 12-volt battery
terminals are not corroded and that
there are no loose connections,
cracks, or loose clamps.
Terminals
Hold-down clamp
■Checking 12-volt battery fluid
Check that the level is between the
“UPPER LEVEL” and “LOWER
LEVEL” lines.
“UPPER LEVEL” line
“LOWER LEVEL” line
If the fluid level is at or below the
“LOWER LEVEL” line, add distilled
water.
■Adding distilled water
1 Remove the vent plug.
2 Add distilled water.
If the “UPPER LEVEL” cannot be seen,
check the fluid level by looking directly at the cell.
3 Put the vent plug back on and
close it securely.
■Before recharging
When recharging, the 12-volt battery produces hydrogen gas which is flam-mable and explosive. Therefore,
observe the following precautions before recharging:
●If recharging with the 12-volt battery installed on the vehicle, be sure to dis-
NOTICE
■When adding coolant
Coolant is neither plain water nor
straight antifreeze. The correct mix- ture 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 prevent it from damaging parts or
paint.
Checking the 12-volt battery

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8-2. Steps to take in an emergency
When trouble arises
1Stop the vehicle in a safe place
and turn off the air conditioning
system.
2 Leave the EV system operating
and carefully lift the hood.
3 Check if the cooling fan is oper-
ating.
If the fan is operating:
Wait until the “EV System over-
heated Output power reduced”
message disappears and then
stop the EV system. If the mes-
sage does not disappear, call
any authorized Toyota retailer or
Toyota authorized repairer, or
any reliable repairer.
If the fan is not operating:
Stop the EV system immediately
and call any authorized Toyota
retailer or Toyota authorized
repairer, or any reliable repairer.
4 After the EV system has cooled
down, inspect the hoses and
radiator core (radiator) for any
leaks.
Radiator
Cooling fan
If a large amount of coolant leaks,
immediately contact any authorized
Toyota retailer or Toyota authorized
repairer, or any reliable repairer.
If your vehicle overheats
When “EV System overheated
Output power reduced” is
shown on the multi-informa-
tion display, your vehicle may
be overheating.
NOTICE
■Cooling system coolant
The radiator coolant is exclusive for radiator usage. Damage may occur when water or any other type of cool-
ant is used, so never use any other fluid. When there is no “Toyota Genu-ine Traction Battery Coolant”, immedi-
ately contact any authorized Toyota retailer or Toyota authorized repairer, or any reliable repairer.
Correction procedures

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8-2. Steps to take in an emergency
5The coolant level is satisfactory
if it is between the “MAX” and
“MIN” lines on the reservoir.
Reservoir
“MAX” line
“MIN” line
6 If the coolant is insufficient,
replenish with “Toyota Genuine
Traction Battery Coolant”.
If you don’t have “Toyota Genuine Trac-
tion Battery Coolant”, contact any authorized Toyota retailer or Toyota authorized repairer, or any reliable
repairer.
1 Remove the bolt.
2 Open the reservoir cap.
Have the vehicle inspected at the
nearest authorized Toyota retailer
or Toyota authorized repairer, or
any reliable repairer as soon as
possible.
WARNING
■To prevent an accident or injury 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 motor compartment may be very hot.
●Keep hands and clothing (espe-cially a tie, a scarf or a muffler)
away from the fan. Failure to do so may cause the hands or clothing to be caught, resulting in serious
injury.
●Do not loosen the coolant reservoir
cap while the EV system and radia- tor are hot. High temperature steam or coolant could spray out.
NOTICE
■When adding coolant
Add coolant slowly after the EV sys-
tem has cooled down sufficiently. Adding cool coolant to a hot EV sys-tem too quickly can cause damage to
the EV system.
■To prevent damage to the cooling
system
Observe the following precautions:
●Avoid contaminating the coolant
with foreign matter (such as sand or dust, etc.).
●Do not use water or any other cool-ant when refilling coolant. Also, do not use any additive agents for the
coolant.