Toyota Yaris Owner's Manual page 461

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.

Keep hands and clothing (especially a tie, a scarf or a muffler) away from
the fan and belts while the engine is operating.

Do not loosen the radiator cap or the coolant reservoir cap while the
engine and radiator are hot.
NOTICE

When adding engine coolant
Add coolant slowly after the engine has cooled down sufficiently. Adding
cool coolant to a hot engine too quickly can cause damage to the engine.

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 additives.
8-2. Steps to take in an emergency
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