GMC 2007 Sierra - Manual (Page 139)

When starting your engine in very cold weather
(below 0°F or
−
18°C), do this:
1. With your foot off the accelerator pedal, turn
the ignition key to START and hold it there up
to 15 seconds. When the engine starts, let
go of the key.
2. If your engine still will not start, or starts but
then stops, it could be flooded with too much
gasoline. Try pushing your accelerator pedal all
the way to the floor and holding it there as you
hold the key in START for about three seconds.
When the engine starts, let go of the key and
accelerator. If the vehicle starts briefly but then
stops again, do the same thing, but this time
keep the pedal down for five or six seconds.
This clears the extra gasoline from the engine.
Notice: Your engine is designed to work with
the electronics in your vehicle. If you add
electrical parts or accessories, you could
change the way the engine operates. Before
adding electrical equipment, check with your
dealer. If you do not, your engine might not
perform properly. Any resulting damage would
not be covered by your vehicle’s warranty.
Engine Coolant Heater
In very cold weather, 0°F (
−
18°C) or colder, the
engine coolant heater can help. You will get easier
starting and better fuel economy during engine
warm-up. Usually, the coolant heater should
be plugged in a minimum of four hours prior to
starting your vehicle. At temperatures above
32°F (0°C), use of the coolant heater is not
required. Your vehicle may also have an internal
thermostat in the plug end of the cord. This
will prevent operation of the engine coolant
heater when the temperature is at or above
0°F (
−
18 C°) as noted on the cord.
To Use the Engine Coolant Heater
1. Turn off the engine.
2. Open the hood and unwrap the electrical
cord. The cord is located on the driver’s
side of the engine compartment, near
the power steering fluid reservoir. If you have
a diesel engine, refer to diesel supplement
for location.
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