Coolant Selection; If The Coolant Level Drops Within A Short Time Of Replenishing; When The Hybrid System Is Hot; When Adding Coolant - Lexus GS450h Owner's Manual

Coolant selection

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Only use "Toyota Super Long Life Coolant" or a similar high quality ethylene glycol
based non-silicate, non-amine, non-nitrite, and non-borate coolant with long-life
hybrid organic acid technology.
U.S.A.:
"Toyota Super Long Life Coolant" is a mixture of 50% coolant and 50% deionized
water. (Minimum temperature: -31F [-35C])
Canada:
"Toyota Super Long Life Coolant" is a mixture of 55% coolant and 45% deionized
water. (Minimum temperature: -44F [-42C])
For more details about coolant, contact your Lexus dealer.

If the coolant level drops within a short time of replenishing

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Visually check the radiator, hoses, engine/power control unit coolant reservoir caps,
drain cock and water pump.
If you cannot find a leak, have your Lexus dealer test the cap and check for leaks in
the cooling system.
CAUTION

When the hybrid system is hot

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Do not remove the engine/power control unit coolant reservoir caps or the cool-
ant inlet cap. (P. 570)
The cooling system may be under pressure and may spray hot coolant if the cap is
removed, causing serious injuries, such as burns.
NOTICE

When adding coolant

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Coolant is neither plain water nor straight antifreeze. The correct mixture of water
and antifreeze must be used to provide proper lubrication, corrosion protection
and cooling. Be sure to read the antifreeze or coolant label.
If you spill coolant
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Be sure to wash it off with water to prevent it from damaging parts or paint.
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