Originally Posted by Ulumanati
hey man, i have the exact same jeep as you do, and had the same problem for the whole summer, and just yesterday did i venture out and buy a can of 134a refrigerant and put it in, my air is nice and cold once again and it didnt seem to leak from yesterday to today, so im glad i didnt have to go and shell out more than 30 bucks... just an idea
Unfortunately though you may have a slower leak that will in time make you go out and spend another $30, which is about half of what most shops (around here at least) charge to evac, flush, replace misc. O-rings, and recharge your entire system. Just some food for thought.
Anyway, to the OP, my girlfriend also sports an '03 WJ, Laredo trim, w/o dual climate control (thankfully) and we have an intermittant problem with the A/C blowing warm, then cold air every so often. After having a shop do a shake down of the system, we found out she was about 1/2 a lb. low on R134A, however the cause of the intermittant cold air was due to the push button A/C switch on the dash not working properly. Unfortunately you cannot just replace the switch, you can only but the entire HVAC stack from MOPAR. Good news is, it only runs about $100 and is pretty easy to install yourself in one afternoon.
Next time you turn on the A/C you may try and give the top of the center stack or the side of it a good solid whack and see if you get some cold air to blow through the vents, if so chances are your switch is bad.