A/c condenser problem?

I have been having a terrible moldy smell in my '08 prius for quite some time. The carpets are dry but they still stink, mainly on the driver's side front and back. After checking the front passenger side carpet padding (its dry) and the spare tire compartment (dry as a bone), I proceeded with removing the driver's seat and pulling up the carpet and padding. To my dismay, behind the drivers seat it was completely soaked underneath. Using a shopvac on the padding I removed several cups of nasty water. What I can't figure out is where it is coming from. It doesn't appear to be dripping anywhere when I run the AC full blast for about 20 minutes. I checked the ac drain tube and it is dry. No leaking water. SO clogged drain tube, right? But there is cold hair blowing out of the drain tube. Is that normal? We tried sucking the tube out with a shopvac end with a duct tape reducer. That didn't do anything. Still no water but quite forceful cold air blowing out. We also tried using wire to get up into the tube to check for clog but nothing came out. Any ideas? I have no idea where to go from here. Should the drain tube weep at all times when the AC runs? Is it normal that its blowing air?