AC sis cold but blows weak

What is your question?

>I have a 2001 Jeep grand Cherokee (6 cylinder) with only 45,000 miles. Recently the AC started acting up. I can feel that the air is cold but the ac system is not blowing good. I can hear the fans working harder as I increase the fan setting to Hi, but it hardly blows any better even on hi. If I had to guess some vent or somthing is not opening fully. And of course I tried all types of setting combinations form defrost to recycled air and so on. can you give me some good advice please?