Before you get too excited, which may already be too late, where is the suspected leak at? Meaning front passenger side, back of engine bay, front of block, drivers side. Etc? I'm assuming that you are aware that after running the car with the A/C you will have condensation from the compressor dripping which is often confused as a leak by those who don't know any better. If ti si your water pump, you would most likely be experienceing an overheating issue as well.