Lexus GS 350, Owner'S Manual, Page: 750 / 831

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7-2. Steps to take in an emergency
GS350_U (OM30C34U)
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Overheating
If you observe the following, your vehicle may be overheating:
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The engine coolant temperature gauge enters the red zone or a loss of power is
experienced.
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Steam comes out from under the hood.
CAUTION
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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 away from the fans, etc. while the engine is operating.
NOTICE
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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.
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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 commercially available coolant additives.
●
Do not loosen the radiator cap while the
engine and radiator are hot.
High temperature steam or coolant could
spray out.