User Manual - Page 647

For 2018 Highlander.

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646
8-2. Steps to take in an emergency
HIGHLANDER_U (OM0E031U)
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 any coolant additive.
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