My A/C

I have a 1993 Grande Cherokee Larado. My a/c had a leak which I fixed with the help of one of our members suggestions of using a stop leak kit. Thanx!! Now, is my a/c compressor supposed to run constantly when I have the a/c on, or is it supossed to kick on and off intermittently? Right now, it stays on continueously when I am running my a/c. Yesturday, it was very humid out, and I had it on. All of a sudden, I started getting fog out of my dash vent outlets. Is this because it's continueously running? Please email me at JeepDriver58@cox.net if you can help me. Thanx....Tom