Ran the hose on the car. Could find no leaks. Next I ran the A/C. Nothing out the bottom, so I cleaned the drains. That helped, but still had a trickle of water. Using a mirror and flashlight I finally found water leaking out of the bottom seam in the heater case. Liberal application of RTV, so far so good. Need to replace a cracked dash board at some point in the future. will probably change the heater case at the same time.