GMC 2003 DURAMAX, Owner'S Manual

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Winter Cover
If your vehicle includes a winter cover it will enhance
heater performance and will reduce the amount of time
it takes to warm the inside of your vehicle in extremely
cold conditions (below 0°F (-18°C)). The winter
cover installs over the front bumper of your vehicle and
restricts the air flowing to the engine compartment
by covering the radiator grille.
Usage Guidelines
The winter cover should only be used while operating
your vehicle in extremely cold temperatures. In
these temperatures, the vehicle does not need a large
amount of air to properly cool the engine. During periods
of operation 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 grille and air cooler performance:
•
Do not use the winter cover when temperatures are
expected to be above 32°F (0°C). Use of the cover
in these conditions could cause your vehicle to
overheat. If this happens while the cover is being
used, remove the cover.
•
Do not use the winter cover if towing a trailer. The
added power needed to tow a trailer requires the
radiator grille to have full airflow under all conditions.
Your vehicle may overheat if the cover is used
while towing a trailer.
•
Do not modify the cover. The winter cover does not
cover some sections of the front of the vehicle
because these openings are needed to provide
enough airflow to the radiator grille and air cooler in
extremely cold temperatures.
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