Black plate (5,1)
Chevrolet/GMC Duramax Diesel Supplement (GMNA Localizing-U.S./Canada-
7132827) - 2015 - CRC - 10/21/14
Driving and Operating
9-5
Fast Idle control will be disabled
when one or more of the following
conditions occur:
.
The cruise control Set switch is
pressed and released. See
“
Cruise Control
”
in the owner
manual.
.
The cruise control Cancel switch
is pressed.
.
The brake pedal is pressed.
.
The transmission is shifted out
of P (Park) or N (Neutral).
.
The parking brake is released.
.
The vehicle speed is not
0 km/h (0 mph).
On vans, when fast idle is active, a
FAST IDLE ON message will be
displayed in the DIC. See
Starting
the Vehicle Messages on
page 5-15
.
Winter Cover
If equipped, the winter cover can be
used to enhance heater
performance in extremely cold
conditions below
−
18°C (0°F). The
winter cover installs over the grille
and restricts airflow to the engine
compartment.
For vehicles that did not come with
a winter cover, a GM winter cover
can be purchased. See your dealer
for additional information.
When the winter cover is in use, the
Heater, Ventilation, and Air
Conditioning AUTO mode may not
function properly. Use the manual
settings for comfort.
Usage Guidelines
The winter cover should only be
used while operating the vehicle in
extremely cold temperatures or in
heavy snow for extended periods. In
these temperatures, the vehicle
does not need a large amount of air
to properly cool the engine. When
more airflow is required to cool the
vehicle, the winter cover should not
be used. The following usage
guidelines will allow adequate
airflow for proper radiator and air
cooler performance:
.
Do not use the winter cover if
towing a trailer. The vehicle may
overheat if the radiator is
covered while towing.
.
Do not use the winter cover if a
snow plow is mounted on the
truck.
