So guys, in what case would you use warm or hot air conditioning? Is it better than just using the plain heater during cold weather when the windows fog up easily, or is the air conditioning not meant to be used hot?

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"It's not what you drive, but how you drive it."

02 Sport in Stone White
-AEM CAI, Borla XS muffler
-Duralast Premium rotors and PFC pads in front (rotors are cool but the pads suck); Satisfied pads in back drums
-6k HID mains, Hella 500 high beams
-Yokohama Geolandar HTS 235/70 R16
-smoke corners with silver turn signal bulbs

Using the air conditioner with the defroster is not a problem, in fact when you turn your control to the defrost mode it should turn on the air conditioner automatically. The reason it does it that way is that the AC also drys the air out, so if it is humid out and you are trying to de-fog the windows the dry air will clear them faster than moist air. Hope this answers your question.

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Kevin
AD5VG
Just another red Jeep in the world...
L.O.S.T. #KB051963

You should use the A/C in defrost mode throughout the winter. This does two things for your Liberty:

1.) As corwyyn pointed out the A/C system removes the humidity in the air. Without that moisture your windows should stay mainly frost free even on really cold / wet days where it's snowing or sleeting outside.

2.) When you use the A/C the pumps cycle the fluid in the system to help prevent leaks due to long durations of inoperation. This really comes in handy in the summers when you need the A/C to cool your vehicles interior to an acceptable level for comfort.

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02 Liberty Limited
Silver Outside & Taupe Inside
Heated Seats, Sunroof & Infinity speakers
USA Spec I-Pod adaptor, Mopar Sub, Garmin GPS
Tow Package, Select-Trac
Rock Rails, Tow Hooks