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When the fast idle is active the
Driver Information Center (DIC) will
display FAST IDLE ON.
One of the following actions will turn
off the fast idle:
Pressing the brake.
Selecting the Cruise Control
Cancel button.
Releasing the Parking Brake.
The transmission shift lever is
moved out of P (Park) or
N (Neutral).
Selecting the Cruise Control
On/Off button when it was
previously on.
Pressing the Cruise Control Set
switch a second time.
Pressing the accelerator greater
than a quarter of the way down.
Turning the ignition switch to the
LOCK/OFF position.
Engine Heater
If the vehicle has a diesel engine,
see the Duramax diesel supplement
for more information.
The engine coolant heater can
provide easier starting and better
fuel economy during engine warm
up in cold weather conditions at or
below 18°C (0°F). Vehicles with an
engine coolant heater should be
plugged in at least four hours before
starting. An internal thermostat in
the plug-end of the cord may exist
which will prevent engine coolant
heater operation at temperatures
above 18°C (0°F).
To Use the Engine Coolant
Heater
1. Turn off the engine.
2. Open the hood and unwrap the
electrical cord.
Driving and Operating
The cord for the engine coolant
heater is located on the driver
side of the engine compartment
and is attached to the hose for
the power steering reservoir.
3. Plug it into a normal, grounded
110-volt AC outlet.
WARNING
Plugging the cord into an
ungrounded outlet could cause an
electrical shock. Also, the wrong
kind of extension cord could
overheat and cause a fire. You
could be seriously injured. Plug
the cord into a properly grounded
three-prong 110-volt AC outlet.
If the cord will not reach, use a
heavy-duty three-prong extension
cord rated for at least 15 amps.
4. Before starting the engine, be
sure to unplug and store the
cord as it was before to keep it
away from moving engine parts
and prevent damage.
9-19
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