cooling TOYOTA C-HR 2023 User Guide

6036-3. Do-it-yourself maintenance
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Maintenance and care
■Coolant selection
Only use “Toyota Super Long Life Coolant” or a similar high qua lity ethylene
glycol based non-silicate, non-am ine, non-nitrite, and non-borate coolant with
long-life hybrid organic acid technology.
“Toyota Super Long Life Coolant” is a mixture of 50% coolant an d 50% deion-
ized water. (Minimum temperature: -35 C [-31F])
For more details about coolant, contact any authorized Toyota r etailer or
Toyota authorized repairer, or any reliable repairer.
■ If the coolant level drops within a short time of replenishing
Visually check the radiator, hoses, engine/power control unit c oolant reservoir
caps, drain cock and water pump.
If you cannot find a leak, have any authorized Toyota retailer or Toyota autho-
rized repairer, or any reliable repairer test the cap and check for leaks in the
cooling system.
WARNING
■ When the hybrid system is hot
Do not remove the engine/power control unit coolant reservoir c aps.
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 coola nt label.
■ If you spill coolant
Be sure to wash it off with water to prevent it from damaging p arts or paint.

6386-3. Do-it-yourself maintenance
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Hybrid batter y (traction batter y) air intake
vent and filter
Remove the dust from the air
intake vent with a vacuum
cleaner, etc.
Make sure to only use a vacuum to
suck out dust and clogs. Attempt-
ing to blow out dust and clogs
using an airgun, etc., may push it
into the air intake vent. ( P. 642)
If dust and clogs cannot be completely removed with the air intake
vent cover installed, remove the cover and clean the filter.
Turn the power switch off.
Using a Phillips screwdriver,
remove the clip.
To prevent the fuel economy from being affected, visually
inspect the hybrid battery (traction battery) air intake vent p eri-
odically for dust and clogs. If it is dusty or clogged or if “M ainte-
nance required for Traction battery cooling parts. See owner’s
manual.” is displayed on the multi-information display, clean t he
air intake vent using the following procedures:
Cleaning the air intake vent
If dust and clogs cannot be completely removed
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6416-3. Do-it-yourself maintenance
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Maintenance and care
■Cleaning the air intake vent
● Dust in the air intake vent may interfere with the cooling of the hybrid battery
(traction battery). If charging/discharging of the hybrid batte ry (traction bat-
tery) becomes limited, the distance that the vehicle can be dri ven using the
electric motor (traction motor) may be reduced and the fuel eco nomy may
be reduced. Inspect and clean the air intake vent periodically.
● Improper handling of the air intake vent cover and filter may result in dam-
age to them. If you have any concerns about cleaning the filter , contact any
authorized Toyota retailer or Toyota authorized repairer, or an y reliable
repairer.
■ If “Maintenance required for Traction battery cooling parts See owner’s
manual.” is shown on the multi-information display
● If this message is shown on the multi-information display, remove the air
intake vent cover and clean the filter. ( P. 638)
● After cleaning the air intake vent, start the hybrid system and check that the
warning message is no longer displayed.
After the hybrid system is started, it may be necessary to driv e the vehicle
up to approximately 20 minutes before the warning message disap pears. If
the warning message does not disappear after driving for approp riately 20
minutes, have the vehicle inspected by any authorized Toyota re tailer or
Toyota authorized repairer, or any reliable repairer.
WARNING
■ When cleaning the air intake vent
● Before cleaning the air intake vent, make sure to turn the power switch off
to stop the hybrid system.
● Do not use water or other liquids to clean the air intake vent. If water is
applied to the hybrid battery (traction battery) or other compo nents, a mal-
function or fire may occur.
■ When removing the air intake vent cover
Do not touch the service plug located near the air intake vent. (P. 125)

6426-3. Do-it-yourself maintenance
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NOTICE
■When cleaning the air intake vent
■ To prevent damage to the vehicle
● Do not allow water or foreign matter to enter the air intake vent when the
cover is removed.
● Carefully handle the removed filter so that it will not be damaged. If the fil-
ter is damaged, have it replaced with a new filter by any autho rized Toyota
retailer or Toyota authorized repairer, or any reliable repaire r.
● Make sure to reinstall the filter and cover to their original positions after
cleaning.
● Do not install anything to the air intake vent other than the exclusive filter
for this vehicle or use the vehicle without the filter installe d.
■ If “Maintenance required for Traction battery cooling parts See owner’s
manual.” is shown on the multi-information display
If the vehicle is continuously driven with the warning message (indicating
that charging/discharging of the hybrid battery [traction batte ry] may
become limited) displayed, the hybrid battery (traction battery ) may mal-
function. If the warning message is displayed, clean the air in take vent
immediately.
When cleaning the air intake vent, make
sure to only use a vacuum to suck out
dust and clogs. If a compressed air blow
gun, etc., is used to blow out dust and
clogs, the dust or clogs may be pushed
into the air intake vent, which may affect
the performance of the hybrid battery
(traction battery) and cause a malfunc-
tion.

6937-2. Steps to take in an emergency
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When trouble arises
■If a message that indicates the need for referring to Owner’s Manual is
displayed
● If “Engine Coolant Temperature High.”is shown, follow the instructions
(P. 755).
● If the following messages are shown, there may be a malfunction. Immedi-
ately stop the vehicle in a safe place and contact any authoriz ed Toyota
retailer or Toyota authorized repairer, or any reliable repaire r. Continuing to
drive the vehicle may be dangerous.
• “Braking Power Low.”
• “Charging System Malfunction.”
• “Engine Oil Pressure Low.”
● If the following messages are shown, there may be a malfunction. Immedi-
ately have the vehicle inspected by any authorized Toyota retai ler or Toyota
authorized repairer, or any reliable repairer.
• “Hybrid System Malfunction.”
• “Check Engine.”
• “Hybrid Battery System Malfunction.”
• “Accelerator system Malfunction.”
• “Entry & Start System Malfunction.”
• “Exhaust filter full.” (P. 529)
• “Hybrid System Stopped”
• “Engine Stopped”
● If the “Low 12-Volt Battery.” is shown,
• When the display goes off after several seconds (displays for about 6
seconds):
Maintain the hybrid system operation for more than 15 minutes a nd
charge the 12-volt battery.
• When the display does not go off:
Start up the hybrid system using the procedures: P. 747
● If “Maintenance required for Traction battery cooling parts. See owner’s
manual.” is shown, the filters may be clogged, the air intake v ents may be
blocked, or there may be a gap i n the duct. Therefore, perform the following
correction procedure.
• If the air intake vents and filters of the hybrid battery (tra ction battery) are
dirty, perform the procedure on P. 638 to clean them.
• If the warning message is shown when the air intake vents and filters of
the hybrid battery (traction battery) are not dirty, have the v ehicle
inspected by any authorized Toyota retailer or Toyota authorize d repairer,
or any reliable repairer immediately.

7547-2. Steps to take in an emergency
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WARNING
■After recharging the 12-volt battery (M20A-FXS engine)
Have the 12-volt battery inspected at any authorized Toyota ret ailer or
Toyota authorized repairer, or any reliable repairer as soon as possible. If
the 12-volt battery is deteriorating, continued use may cause t he 12-volt
battery to emit a malodorous gas, which may be detrimental to t he health of
passengers.
■ When replacing the 12-volt battery
● When the vent plug and indicator are close to the hold down clamp, the
battery fluid (sulfuric acid) may leak.
● For information regarding 12-volt battery replacement, contact any autho-
rized Toyota retailer or Toyota authorized repairer, or any rel iable repairer.
● M20A-FXS engine: After exchanging, securely attach the exhaust hose
and exhaust hole plug to the exhaust hole of the exchanged 12-v olt bat-
tery. If not properly installed, gases (hydrogen) may leak into the vehicle
interior, and there is the possible danger of the gas igniting and exploding.
NOTICE
■When handling jumper cables
When connecting the jumper cables, ensure that they do not beco me entan-
gled in the cooling fans, etc.
■ To prevent damaging the vehicle (M20A-FXS engine)
The exclusive jump starting terminal is to be used when chargin g the 12-volt
battery from another vehicle in an emergency. It cannot be used to jump
start another vehicle.

7557-2. Steps to take in an emergency
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When trouble arises
If your vehicle overheats
●The needle of the engine coolant temperature gauge (P. 1 6 4 )
enters the red zone or a loss of hybrid system power is experi-
enced. (For example, the vehicle speed does not increase.)
● “Hybrid System Overheated Reduced Output Power.” is shown on
the multi-information display.
● Steam comes out from under the hood.
■If the high coolant temperature warning light comes on
Stop the vehicle in a safe place and turn off the air condition ing
system, and then stop the hybrid system.
If you see steam:
Carefully lift the hood after the steam subsides.
If you do not see steam:
Carefully lift the hood.
After the hybrid system has cooled down sufficiently, inspect t he
hoses and radiator core (radiator) for any leaks.
Radiator
Cooling fans
If a large amount of coolant leaks, immediately contact any aut ho-
rized Toyota retailer or Toyota authorized repairer, or any rel iable
repairer.
The following may indicate that your vehicle is overheating.
Correction procedures
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2ZR-FXE engineM20A-FXS engine

7567-2. Steps to take in an emergency
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The coolant level is satisfactory if it is between the “FULL” and
“LOW” lines on the reservoir.
Reservoir
“FULL” line
“LOW” line
Add coolant if necessary.
Water can be used in an emer-
gency if coolant is unavailable.
Start the hybrid system and turn the air conditioning system on to
check that the radiator cooling fans operate and to check for
coolant leaks from the radiator or hoses.
The fans operate when the air conditioning system is turned on immedi-
ately after a cold start. Confirm that the fans are operating b y checking
the fan sound and air flow. If it is difficult to check these, turn the air con-
ditioning system on and off repeatedly. (The fans may not opera te in
freezing temperatures.)
If the fans are not operating:
Stop the hybrid system immediately and contact any authorized
Toyota retailer or Toyota authorized repairer, or any reliable
repairer.
If the fans are operating:
Have the vehicle inspected at the nearest any authorized Toyota
retailer or Toyota authorized repairer, or any reliable repaire r.
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7577-2. Steps to take in an emergency
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When trouble arises
■If “Hybrid System Overheated Reduced Output Power.” is
shown on the multi-information display
Stop the vehicle in a safe place.
Stop the hybrid system and carefully lift the hood.
After the hybrid system has cooled down, inspect the hoses and
radiator core (radiator) for any leaks.
Radiator
Cooling fans
If a large amount of coolant leaks, immediately contact any aut ho-
rized Toyota retailer or Toyota authorized repairer, or any rel iable
repairer.
The coolant level is satisfactory if it is between the “FULL” o r “F”
and “LOW” or “L” lines on the reservoir.
Reservoir
“FULL” or “F” line
“LOW” or “L” line
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2
3
2ZR-FXE engineM20A-FXS engine
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2ZR-FXE engineM20A-FXS engine

7597-2. Steps to take in an emergency
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When trouble arises
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 engine compartment may be very hot.
● After the hybrid system has been turned off, check that the indicator on the
power switch and the “READY” indicator are off.
When the hybrid system is operating, the gasoline engine may au tomati-
cally start, or the cooling fans may suddenly operate even if t he gasoline
engine stops. Do not touch or approach rotating parts such as t he fan,
which may lead to fingers or clothing (especially a tie, a scar f or a muffler)
getting caught, resulting in serious injury.
● Do not loosen the coolant reservoir caps while the hybrid system and radi-
ator 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 suff iciently.
Adding cool coolant to a hot hybrid system too quickly can caus e damage to
the hybrid 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 any coolant additive.