Toyota 2015 Prius Owner's Manual page 454

4-3. Do-it-yourself maintenance
Coolant selection
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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% 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 coolant, contact your Toyota dealer.
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
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.
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