Lexus LS 600h L 2012 Owner's Manual page 545

5-2. Steps to take in an emergency
Overheating
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The following symptoms may occur when your vehicle is overheating:
Hybrid system output decreases.
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Steam is coming from the engine area.
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CAUTION
To prevent an accident or injury when inspecting under the hood of your vehicle
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If steam is seen coming from under the hood, do not open the hood until the
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steam has subsided. The engine compartment may be very hot, causing serious
injury such as burns.
With a hybrid vehicle, there are times when the gasoline engine automatically
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starts to run or the cooling fans suddenly start to operate. Do not touch or
approach the rotating parts of the belt or fans. Doing so may lead to fingers,
clothes or tools getting caught, resulting in an accidental injury.
Do not loosen the coolant reservoir cap while the hybrid system and radiator are
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hot.
Serious injury, such as burns, may result from hot coolant and steam released
under pressure.
NOTICE
When adding engine/power control unit coolant
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Wait until the hybrid system has cooled down before adding engine/power control
unit coolant.
When adding coolant, do so slowly. Adding cool coolant to a hot hybrid system too
quickly can cause damage to the hybrid system.
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