Toyota 2015 Corolla Owner's Manual page 511

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 additives.
●
COROLLA_TMMMS_TMMC_U (OM12F00U)
8-2. Steps to take in an emergency
539
8