Toyota 2014 Sienna Manual page 678

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 similar high quality ethylene
glycol based non-silicate, non-amine, non-nitrite, and non-borate coolant
with long-life hybrid organic acid technology.
U.S.A.: "Toyota Super Long Life Coolant" is a mixture of 50 % coolant
and 50 % deionized water.
(Minimum temperature: -31F [-35C])
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 caps 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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Reservoir cap
"FULL"
"LOW"
If the level is on or below the
"LOW" line, add coolant up to the
"FULL" line.