I had a Mazda 626 that was leaking water/antifreeze from behind the console/dash onto the floor. I never fixed the issue which was a small radiator/ heater coil that Mazda put in the worst place possible to try and fix under the dash. My guess would be that it is the heater coil/radiator which gives you your inside heat when the car is up to temperature, so you can turn on your fan and get heat. It could be something as simple as a loose hose clamp. I just let mine drip until I got rid of the car at 300,000 miles. If the water is sticky, then it's from your cooling system which is tied in with your cars heating system.