Toyota 2012 Yaris Hatchback Owner's Manual page 225

4-3. Do-it-yourself maintenance
Engine coolant
The coolant level is satisfactory if it is between the "FULL" and "LOW"
lines on the reservoir when the engine is cold.
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Coolant selection
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.
Except Canada:"Toyota Super Long Life Coolant" is a mixture of 50% cool-
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 engine coolant, contact your Toyota dealer.
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If the coolant level drops within a short time of replenishing
Visually check the radiator, hoses, engine coolant reservoir cap, radiator
cap, drain cock and water pump.
If you cannot find a leak, have your Toyota dealer test the cap and check for
leaks in the cooling system.
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ant and 50% deionized water. (Minimum temperature: -31°F
[-35°C])
Reservoir cap
"FULL" line
"LOW" line
If the level is on or below the
"LOW" line, add coolant up to the
"FULL" line.