2011 Toyota Prius Owners Manual - Page 465

4-3. Do-it-yourself maintenance Engine/power control unit coolant The coolant level is satisfactory if it is between the "FULL" and "LOW" lines on the reservoir when the hybrid system is cold. Engine coolant reservoir Reservoir cap "FULL" "LOW" If the level is on or below the "LOW" line, add coolant up to the "FULL" line. ITO43P111 Power control unit coolant reservoir Reservoir cap Full Low If the level is on or below the "L" line, add coolant up to the "F" line. n If the coolant level drops within a short time after replenishing Visually check the radiator, hoses, reservoir 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. 442 PRIUS_U (OM47685U) DVD