Lexus ES300h Owner's Manual page 530

530
8-2. Steps to take in an emergency
WARNING
When inspecting under the hood of your vehicle
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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
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has subsided. The engine compartment may be very hot.
After the hybrid system has been turned off, check that the indicator on the power
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switch and the "READY" indicator are off.
When the hybrid system is operating, the gasoline engine may automatically start, or
the cooling fan may suddenly operate even if the gasoline engine stops. Do not touch
or approach rotating parts such as the fan, which may lead to fingers or clothing
(especially a tie, a scarf or a muffler) getting caught, resulting in serious injury.
Do not loosen the radiator cap or the coolant reservoir cap while the hybrid system
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and radiator are hot. High temperature steam or coolant could spray out.
NOTICE
When adding engine/power control unit coolant
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Add coolant slowly after the hybrid system has cooled down sufficiently. Adding cool
coolant to a hot hybrid system too quickly can cause damage to the hybrid system.
To prevent damage to the cooling system
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Observe the following precautions:
Avoid contaminating the coolant with foreign matter (such as sand or dust etc.).
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Do not use any coolant additives.
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