BMW X5 AC problem

[AceWynn]

Hey guys,

I'm having trouble with my 2002 bmw x5 that I purchased back in March of 2010. I'll start off explaining the situation and hopefully I can get some input.

My AC start off being a little cool on the drivers side and the passenger side was running warm. I added more refrigerant in there and the AC was cool on both sides. After having it run for pretty cool for a month or so, it just stopped be cold. The AC is blowing as the same temp as it is outside of the SUV. I researched it and this site came up and many folks suggested a aux fan replacement and also replacing the FSU, which i did. It still blows hot.

What should I try next? I rather not take it to a place to look at it because most places around my area charge for looking at it and I'm planning to fix it myself to save on costs. Any suggestions would be a big help. Thanks!