Cooling System - GMC T-Series 2007 Owner's Manual

If you no longer have the overheat warning,
you can drive. Just to be safe, drive slower for
about 10 minutes. If the warning does not
come back on, you can drive normally.
If the warning continues and you have not
stopped, pull over, stop, and park your vehicle
right away.
If there is still no sign of steam, you can push
down the accelerator until the engine speed is
about twice as fast as normal idle speed for at least
three minutes while you are parked. If you still have
the warning, turn off the engine and get everyone
out of the vehicle until it cools down.
You may decide not to lift the hood but to get
service help right away.

Cooling System

CAUTION:
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If your vehicle has air conditioning, the
auxiliary electric fan under the hood can
start up even when the engine is not
running and can injure you. Keep hands,
clothing and tools away from any
underhood electric fan.
If the coolant inside the coolant surge tank is
boiling, do not do anything else until it cools down.
The vehicle should be parked on a level surface.
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