Engine Overheating - Chevrolet 2010 Colorado Owner's Manual

At any time during this procedure if coolant begins to
flow out of the filler neck, reinstall the pressure cap.
Notice: If the pressure cap is not tightly installed,
coolant loss and possible engine damage may
occur. Be sure the cap is properly and tightly
secured.

Engine Overheating

The vehicle has a coolant temperature gage displayed
on the instrument panel to warn if the engine is
overheating. See Engine Coolant Temperature Gage on
page 4-27. If the engine is too hot, the air conditioning
might stop working. This is normal and helps cool
the engine.
You may decide not to lift the hood when the warning
appears, but instead get service help right away.
See Roadside Assistance Program on page 8-8.
6-32
If you do decide to lift the hood, make sure the vehicle
is parked on a level surface.
Then check to see if the engine cooling fan is running.
If the engine is overheating, the fan should be
running. If it is not, do not continue to run the engine
and have the vehicle serviced.
The engine cooling fan speed should increase when
idle speed is doubled by pushing the accelerator pedal
down. If it does not, the vehicle needs service. Turn
off the engine.
Notice: Engine damage from running the engine
without coolant is not covered by the warranty.
Notice: If the engine catches fire because of being
driven with no coolant, your vehicle can be badly
damaged. The costly repairs would not be covered
by the vehicle warranty.