check the pressure, if the pressure is to low the compressor will not turn on. if you filled the system, which with one can I don't think that you did, and it leaked out that fast you have a major leak

I may suggest checking the dryer for rust


- 95 Mystique LS - Zetec/5spd - 99 Contour SeVT Sport - Duratec/5spd Official NE-CEG Contour/Mustang Family