Now that I finally got my X put back together and took it for a drive, I realized that my Air Con is pretty temperamental. It only works when I'm moving at like 25-30+ MPH and sometimes doesn't work even then. It's not that it isn't cold, it just moves no air, because when the air does move it's like an icebox in my car. Anything I should look at to solve the problem? Common fixes? Whatever advice you can give!

__________________
2005 X5 E53, 167k Miles: Kenwood DNX893S Head Unit, Mud Flaps (Rear Only) , Rim Shopping(WIP), Full Spectrum RGB Halos,