Air Conditioner on a 2.5 L 98 Wrangler

[Grand Master B]

WEll - i got my alternator issue fixed - now my next question is my Air Conditioner. It works fine, but ever since i went out on May long, it's making a little more racket than it did before...(kind of a 'hissing) Any one ever run into this? Are there lubrication points on it? I've heard that A/C is kind of rare on jeeps, but this one is out of California...i think.