The air conditioner only seems to be working/blowing through the bottom vents, and not the main vents.
Usually a sign of a stuck blend door under the dash.
Could be a faulty blend door actuator, or the main controller.
You may need a shop manual to make the repairs since this is generally beyond the abilities of a DIY repair book.
SOURCE: 2002 Jeep Liberty 3.7L air conditioner bearing replacement
did you check the recall items for this?
SOURCE: 2001 Jeep Liberty air conditioner
Check the cooling fan relay. Have a guy(or girl) at an auto part store (AutoZone, etc..) hook up a diagnostic code reader to the hookup uner the steering column dash. I replaced mine, but it was timely and alittle tricky. If you have some tech ability, you can do it, but if not, it will probably be about $350.
If you let the jeep run with the a/c on, look at the cooling fan and see if it cycles on after a few minutes. If it doesnt, it could be the relay, if it does come on, then it could be a condensor prob.
SOURCE: 05 jeep wrangler no air/heat when blower is on low
sound like you have a bad blower resister some have a module next to the fan on the passenger side by your feet there is a resister that is inserted in to the blower box or black box that is a module that is inserted that neads to be changed
SOURCE: 2003 3.7 Jeep Liberty Limited Air conditioner
half can is low, possible cause is that fill port is clogged happens when u put sealer in sometimes, but it sounds like your system is under charged check pressure, if no reading port is clogged change port, low reading add freon,
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