Toyota 2012 Prius Owner's Manual page 491

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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.
U.S.A.: "Toyota Super Long Life Coolant" is a mixture of 50% cool-
Canada: "Toyota Super Long Life Coolant" is a mixture of 55% cool-
For more details about 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/power control unit coolant reser-
voir 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.
CAUTION
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When the hybrid system is hot
Do not remove the engine/power control unit coolant reservoir caps.
The cooling system may be under pressure and may spray hot coolant if the
cap is removed, causing serious injuries, such as burns.
PRIUS PHV_OM_OM47818U_(U)
ant and 50% deionized water. (Minimum temperature: -31 °F
[-35 °C])
ant and 45% deionized water. (Minimum temperature: -44 °F
[-42 °C])
4-3. Do-it-yourself maintenance
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