Jeep 2009 Wrangler Unlimited - Owner Manual - Manual (Page 272)

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
obstructions. Vacation Storage
Anytime you store your vehicle or keep it out of service
(i.e., vacation) for two weeks or more, run the air
conditioning system at idle for about five minutes in the
fresh air and high blower setting. This will ensure
adequate system lubrication to minimize the possibility
of compressor damage when the system is started again.
270 UNDERSTANDING YOUR INSTRUMENT PANEL