2004 Mitsubishi Outlander leaking AC

I just had my airconditoner fixed and under the dash would leak and cause a wet floor. They replaced the blower and hose. It has worked for 3 weeks and tonight after a long drive I stopped at light and started leaking again. I would hear the swooshing. Same sounds, same problem. I had previoulsy had the compressor switch replaced. This is the 2nd repair and 700 dollars and problem is still happening.