Toyota 2012 Prius Owner's Manual page 627

5-2. Steps to take in an emergency
■
If "HYBRID SYSTEM OVERHEAT" is shown on the multi-infor-
mation display
STEP 1
Stop the vehicle in a safe place.
STEP 2
Stop the hybrid system and carefully lift the hood.
STEP 3
STEP 4
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PRIUS PHV_OM_OM47818U_(U)
After the hybrid system has
cooled down, inspect the hoses
and radiator core (radiator) for
any leaks.
Radiator
Cooling fans
If a large amount of coolant leaks,
immediately contact your Toyota
dealer.
The coolant level is satisfactory if
it is between the "F" and "L" lines
on the reservoir.
Reservoir
"F"
"L"