I went to vacuum my wife's 2006 gs430 a few days ago only to find the entire drivers side floor to be soaked. I'm talking multiple gallons of water. Passenger side was totally dry. Try as i might I couldn't get any water back in that car after trying all kinds of stuff all day. Does this sound like the ac drain plug?

 

Yes, if I remember correctly this only pertains to 2006 and 2007, for some odd reason 08-up do not have this issue

 

Well i figured out why the hard way. Basically it gets clogged over time without the grommet. Now i have to lower the transmission and use a blast of air