Toyota Prius 2011 Manual page 442

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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

Power control unit coolant reservoir

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.

Reservoir cap

If the level is on or below the

"LOW" line, add coolant up to the

"FULL" line.

Reservoir cap

If the level is on or below the "L"

line, add coolant up to the "F" line.