Lexus 2013 GS 350 Owner's Manual page 722

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