It is the evaporator core. I know of this occurring on two 2001's -- the seams deteriorate and it leaks. The real fix is VERY expensive (replacing the evap core, which is an expensive part plus you have to remove most of the dash to get to it). But there is a ultra-cheapo, super-not-fancy work-around that doesn't cost but a few bucks and about an hour of your time.I have the same AC leak, with the cassical swushing sound when turning left. And the AC draining pipe is NOT clogged. The AC works fine, mabe slightly weaker. Suggestions?