TOYOTA 2010 Prius - Manual (Page 453)

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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
Reservoir cap
“FULL”
“LOW”
If the level is on or below the
“LOW” line, add coolant up to the
“FULL” line.
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.
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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.