Pontiac 2003 Bonneville Owner's Manual page 289

If Steam Is Coming From Your Engine
Steam from an overheated engine can
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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.
Notice: If your engine catches fire because you
keep driving with no coolant, your vehicle can
be badly damaged. The costly repairs would not be
covered by your warranty.
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