If Steam Is Coming From Your Engine; Steam from an overheated engine can burn you; badly, even if you just open the hood. Stay away- Page 313

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If Steam Is Coming From Your Engine

CAUTION:

Steam from an overheated engine can burn you
badly, even if you just open the hood. Stay away
from the engine if you see or hear steam coming
from it. Just turn it off and get everyone away
from the vehicle until it cools down. Wait until
there is no sign of steam or coolant before you
open the hood.

If you keep driving when your engine is
overheated, the liquids in it can catch fire. 
You or others could be badly burned. Stop your
engine if it overheats, and get out of the vehicle
until the engine is cool. See “Overheated Engine
Protection Operating Mode” in the Index for
information on driving to a safe place in an
emergency.