2008 Toyota Prius Owners Manual - Page 399

4-3. Do-it-yourself maintenance n If the coolant level drops within a short time after replenishing Visually check the radiator, hoses, engine coolant filler cap, radiator cap, drain cock and water pump. If you cannot find a leak, have your Toyota dealer pressure test the cap and check for leaks in the cooling system. n 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. (Enabled: -31°F [-35°C]) Canada: "Toyota Super Long Life Coolant" is a mixture of 55% coolant and 45% deionized water. (Enabled: -44°F [-42°C]) For more details about engine coolant, contact your Toyota dealer. CAUTION n When the coolant is hot Do not remove the radiator cap. The cooling system may be under pressure and may spray hot coolant if the cap is removed, causing burns or other injuries. NOTICE n When adding the coolant Coolant is neither plain water not straight antifreeze. The correct mixture of water and anti freeze must be used to provide proper lubrication, corrosion protection and cooling. Be sure to read the antifreeze or coolant label. n If you spill coolant Be sure to wash it off with water to prevent it damage to parts or paint. 372 PRIUS_U_(L/O_0802)