2016 TOYOTA MIRAI radiator cap

3257-3. Do-it-yourself maintenance
MIRAI_OM_USA_OM62004U
7
Maintenance and care
■If the inverter coolant level drops within a short time of replenishing
Visually check the radiators, hoses, inverter coolant reservoir cap, 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 system.
Check the radiator and condenser an d clear away any foreign objects.
If either of the above parts is ex tremely dirty or you are not sure of
their condition, have yo ur vehicle inspected by your Toyota dealer.
WARNING
■When the fuel cell system is hot
Do not remove the 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 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
Be sure to wash it off with water to prevent it from damaging parts or paint.
Radiator and condenser
WARNING
■When the fuel cell system is hot
Do not touch the radiator or condenser as they may be hot and cause seri\
-
ous injuries, such as burns.

4108-2. Steps to take in an emergency
MIRAI_OM_USA_OM62004U
Start the fuel cell system and turn the air conditioning system on
to check that the radiator coo ling fans operate and to check for
coolant leaks from th e 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 by 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 operate in freezing temperatures.)
If the fans are not operating:
Stop the fuel cell system immediately and contact your Toyota
dealer.
If the fans are operating:
Have the vehicle inspected at the nearest Toyota dealer.
WARNING
■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.
● After the fuel cell system has been turned off, check that the “READY”
indicator is off.
When the fuel cell system is operating, the cooling fans may suddenly
operate even if the fuel cell system stops. Do not touch or approach rotat-
ing parts such as the fans, which may lead to fingers or clothing (espe-
cially a tie, a scarf or a muffler) getting caught, resulting in serious injury.
● Do not loosen the coolant reservoir caps or radiator cap, while the fuel cell
system and radiator are hot.
High temperature steam or coolant could spray out.
6
7

4199-1. Specifications
MIRAI_OM_USA_OM62004U
9
Vehicle specifications
*: The fluid capacity is a reference quantity.If replacement is necessary, contact your Toyota dealer.
Cooling system
Capacity*
Fuel cell
stack 5.2 qt. (19.6 L, 4.3 Imp.qt.)
Inverter 1.2 qt. (4.7 L, 1.0 Imp.qt.)
Coolant
type
Fuel cell
stack“Toyota Genuine FC Stack Coolant”
• In order to safely cool the fuel cell stack,
which is at high voltages, the fuel cell stack
coolant is an exclusive high insulation prod-
uct.
• Never use water or other kinds of coolants as they will cause damage.
• Coolant changes are unnecessary.
• Do not reuse coolant that has been removed from the radiator.
• Coolant is colorless.
• Consult your Toyota dealer about replenish- ing or changing the fuel cell stack coolant.
Inverter Use either of the following:
• “Toyota Super Long Life Coolant”
• A similar high-quality ethylene glycol-based
non-silicate, non-amine, non-nitrite, and
non-borate coolant with long-life hybrid
organic acid technology
Do not use plain water alone.
NOTICE
The fuel cell stack coolant is exclusive for
fuel cell stack usage. Damage may occur
when water or any other type of coolant
is used, so never use any other fluid.
If the fuel cell stack coolant is low, imme-
diately contact your Toyota dealer.

458Alphabetical index
MIRAI_OM_USA_OM62004U
Radar cruise control (dynamic radar cruise control) ............. 203
Radiator .................................... 325
Radio
*
Rear Crossing Traffic Alert ..... 245
Rear interior lights................... 270 Wattage ................................ 421
Rear side marker lights ........... 187
Light switch ........................... 187
Replacing light bulbs............. 358
Rear turn signal lights............. 185
Replacing light bulbs............. 358
Turn signal lever ................... 185
Rear view mirror
Inside rear view mirror .......... 149
Outside rear view mirrors...... 151
Rear view monitor system
*
Rear window defogger ............ 261
Refueling .................................. 198 Capacity ................................ 418
Fuel types ............................. 418
Opening the fuel door ........... 200
Regenerative braking ................ 81
Replacing
Electronic key battery ........... 353
Fuses .................................... 355
Light bulbs ............................ 358
Tires ...................................... 339
Reporting safety defects for U.S. owners ...................... 444
Road accident cautions ............ 92 Safety Connect ........................ 299
Seat belt reminder light .......... 371
Seat belts ................................... 30
Adjusting the seat belt ............ 31
Automatic Locking Retractor (ALR) .................... 32
Child restra int system
installation ............................ 56
Cleaning and maintaining the seat belt........................ 311
Emergency Locking Retractor
(ELR) .................................... 32
How to wear your seat belt ..... 30
How your child should wear the seat belt.......................... 32
Pregnant women, proper seat belt use ......................... 33
Reminder light and buzzer.... 371
Seat belt extender .................. 32
Seat belt pretensioners........... 31
SRS warning light ................. 370
Seat heaters ............................. 268
Seat position memory ............. 140
Seating capacity ...................... 169
RS