My 97 Wrangler (2.5L) air conditioning is not cold, but here's the odd thing. The lines are ice cold right up to the point where they meet the firewall. Coming out of the firewall they are not cold at all. Seems like a blockage, but I'm guessing it could be in the condenser, the dryer, or even somewhere else between the firewall and compressor. Are there any screens, orifices, or other components that tend to get blocked?
This is a bump more than a serious recommendation, but remove it, I hear nothing but problems with them, and put in an onboard air compressor (the 60 dollar ones bolt perfectly in its place) :-) Bump though!
Jeep: A four-wheel drive vehicle of one-half- to one-and-one-half-ton capacity for reconnaissance or other army duty.
Low pressure could be causing the line to frost over, remember the AC system is all heat exchange so the line coming back out of the evaporator coil is not going to be cold like the line going in because of the air that has been pushed through the coil and out the vents.
A lot of men have seen me raise some hell in my time, but not one man alive has seen me raise a blister.
Opened up the system, blew air through the lines to check for blockage (none), reconnected the lines and added a can of refrigerant. Works great now!
So, it sounds like you were just low on refrigerant afterall. Now I highly recommend you get it serviced right because you do not know how much oil you have. Ea. can of refrigerant has an amount of oil included, but opening up and blowing your lines makes the amount of oil in the system questionable. You can run like you are, but if under lubed, it may cause early failure of your compressor.
air is never recommended to blow out or pressurize an ac system. air has moisture in it and is non condensable. if you open up your refrigerant lines and expose them to air you should change your accumulator/drier and pull it into a deep vacuum. do a triple evac with dry nitrogen to limit the amount of moisture in the system
my compressor took a crap on me last fall. i swapped it out this spring and when i pressure tested it i found that the evaporator coil(inside cooling coil) was leaking. this is not uncommon for late 90's chryslers. i ripped out my seats,steering column and entire dash to replace the evap coil. while i had everything exposed i also swapped out the heater core and blower motor. took forever.
your system might be low on refrigerant but with the warm weather these past few days it's possible the pressures are maintaining just enough where it doesn't cool and doesn't shut off on low pressure.
Do yourself a favor and go to a shop and have them remove the freon and pull the system in a vaccum!! As leeroy said using compressed air was a bad idea! Any time the system is open it should be pulled in a vaccum before charging.