Toyota Prius 2011 Manual page 558

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5-2. Steps to take in an emergency

Check to see if the cooling fans are operating.

If the fans are operating: 

Wait until the high coolant temperature warning light goes

off and then stop the hybrid system.

If the fans are not operating: 

Stop the hybrid system immediately and call your local

Toyota dealer.

After the hybrid system has

cooled down sufficiently, check

the engine coolant level and

inspect the radiator core (radia-

tor) for any leaks.

If necessary, add engine coolant

up to the "FULL" line.

Water can be used in an emer-

gency measure if engine coolant

is unavailable. (P. 572)