Lexus IS300H 2017 Manual page 520

520
7-3. Do-it-yourself maintenance
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.
"Toyota Super Long Life Coolant" is a mixture of 50% coolant and 50% deionized water.
(Minimum temperature: -35C [-31F])
For more details about coolant, contact any authorized Lexus retailer or Lexus autho-
rized repairer, or any reliable repairer.
If the coolant level drops within a short time of replenishing
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Visually check the radiators, hoses, engine/power control unit coolant reservoir caps,
drain cock and water pump.
If you cannot find a leak, have any authorized Lexus retailer or Lexus authorized repairer,
or any reliable repairer, test the cap and check for leaks in the cooling system.
WARNING
When the hybrid system is hot
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Do not remove the engine/power control unit coolant reservoir caps or water filler cap.
(P. 636)
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 cool-
ing. 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.