If Your Vehicle Overheats - Toyota Prius Owner's Manual

5-2. Steps to take in an emergency

If your vehicle overheats

The following may indicate that your vehicle is overheating.
 The high coolant temperature warning light (P. 500) comes on
or flashes, or a loss of hybrid system power is experienced. (For
example, the vehicle speed does not increase.)
 "HYBRID SYSTEM OVERHEAT" (P. 517) is shown on the
multi-information display.
 Steam comes out from under the hood.
Correction procedures

If the high coolant temperature warning light comes on or
flashes
STEP 1
Stop the vehicle in a safe place and turn off the air condition-
ing system, and then stop the hybrid system.
STEP 2
If you see steam:
If you do not see steam:
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Carefully lift the hood after the steam subsides.
Carefully lift the hood.