GMC 2007 Sierra 1500 Pickup Owner's Manual page 506

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. 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 the vehicles
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.
506
CAUTION: (Continued)
CAUTION: (Continued)
See Overheated Engine Protection
Operating Mode (V8 Engines Only) on
page 508 for information on driving to a
safe place in an emergency.
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. See
Overheated Engine Protection Operating Mode
(V8 Engines Only) on page 508 for information
on driving to a safe place in an emergency.