I too have a large pool of water that accumulates under my car ONLY when the AC is running. By large, I mean the pool becomes 3'x3' after the car is shut off.

Any ideas what this could be?

It is leaking from the center section of the vehicle.
It is not greasy, sticky, etc. It appears to be water. There is no coloration to the substance.
If it's indeed water from the AC condenser... I'm concerned about the volume. What could cause this type of volume and is it a bigger issue?
The car is a 2002 4.4i
All Fluid Levels are acceptable.
If I turn off the AC, the leak ceases


I just purchased the vehicle this week... so I'd appreciate any advice one can provide