Thanks to all!!!
So, I got under the car, no water draining from the hose...tried to poke at it with a screwdriver, got a little crud out, but it's quite twisty.
So I took off the glove box, removed the plastic valance covering the blower motor, pulled back the carpet, searching for the tube -- there it is coming off the condenser in the center of the car. Pulled the hose off, and a FLOOD of water drained into the carpet.
But how to clear the hose? It's very twisty on both sides...and I'm on vacation and don't have access to all my tools. So I pushed my head into the footwell. Pushed harder. Had my forehead against the heater and the side of my head against the console trim...JUST managed to get my mouth onto the hose...blew hard and...whatever was blocking things just slid right out and the hose was cleared.
Put everything back together. Turned on the a/c and watched happily as water dripped steadily from the hose under the car. A/C better, carpet is drying out, everything good.
Thanks to all!