AC not working on driver side 1999 Aurora

My wifes 1999 Aurora stopped blowing cold air on the driver side, passenger side works fine, any ideas as to how to repair this problem.

Thanks

From my personal experience, and as it has been written in the forums over the years, this is common as it is the system letting you know that you are getting low on freon. Put a can in and you should be back to full cold on both. I think the system only holds 2 lbs, unlike the older cars that held up to 4 or so, so when it gets a little low, you feel it right away.