Engine Coolant Heater - GMC T-Series 2007 Owner's Manual

Once started, the engine should be placed
under load to allow the engine coolant
temperature to reach 150°F (66°C) before
shutting off the engine.

Engine Coolant Heater

Your vehicle may be equipped with this feature.
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°) as noted on the cord.
To Use the Engine Coolant Heater
1. Turn off the engine.
2. Find the cord on the drivers side in the engine
compartment.
3. Plug it into a normal, grounded 110-volt AC
outlet.
CAUTION:
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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. If you do
not, it could be damaged.
How long should you keep the coolant heater
plugged in? The answer depends on the outside
temperature, the kind of oil you have, and some
other things. Instead of trying to list everything here,
we ask that you contact your dealer/retailer in the
area where you will be parking your vehicle. The
dealer/retailer can give you the best advice for that
particular area.
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