Lexus RX 450h 2014 Owner's Manual page 793

5-2. Steps to take in an emergency
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.
To prevent damage to the cooling system
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Observe the following precautions:
Avoid contaminating the coolant with foreign matter (such as sand or dust etc.).
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Do not use any coolant additives.
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