Dodge 2009 Durango - Manual (Page 284)

Regular cleaning of the inside of the windows with a
non-filming cleaning solution (vinegar and water works
very well) will help prevent contaminants (cigarette
smoke, perfumes, etc.) from sticking to the windows.
Contaminants increase the rate of window fogging.
Summer Operation
Air conditioned vehicles must be protected with a high
quality antifreeze coolant during summer to provide
proper corrosion protection and to raise the boiling point
of the coolant for protection against overheating. A 50 %
concentration is recommended.
Winter Operation
When operating the system during the winter months,
make sure the air intake, located directly in front of the
windshield, is free of ice, slush, snow, or other obstruc-
tions. This will also prevent snow ingestion into the
ducts.
282 UNDERSTANDING YOUR INSTRUMENT PANEL