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GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13337776) - 2020 - CRC - 8/27/19
Driving and Operating
215
When
h
is illuminated, the system
is enabled.
Engine Heater
If equipped, the engine 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 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 heater
operation at temperatures above
−
18 °C (0 °F).
{
Warning
Do not plug in the engine block
heater while the vehicle is parked
in a garage or under a carport.
Property damage or personal
injury may result. Always park the
vehicle in a clear open area away
from buildings or structures.
1500 Base Model shown other
models are similar
2500/3500
To Use the Engine Heater
1. Turn off the engine.
2. Check the heater cord for
damage. If it is damaged, do
not use it. See your dealer for
a replacement. Inspect the
cord for damage yearly.
3. 1500 only, remove the engine
heater connector cover by
gently prying with a flat
blade tool.
4. Plug the heater cord into the
connector in the front fascia.