I think I may have found it...
I was looking in the wrong spot all along... I was concentrating on the front window and door seals and the couple of small gashes in the pan...
posted this in 2006 and didn't find it...
in 2007 I had a baby and didn't have time...
in 2008 I was in wisconsin and it was frozen so it was impossible to find it then...
now it's 2009 and I'm back in the pacific northwet...
...
last month I caught my car in a half-fogged state while on a break at work... it was the rear that was fogging up first!
so without me in it breathing heavy and fogging up the front with my breath and damp clothes it was actually the rear fogging up first...
so I started poking around back there and found wet carpet... and a wet metal panel to the right of the rear door latch... and wet behind the rear door panel...
so I started checking out the rear door window seals... the bottom corner chrome pieces had popped up a little and debris was accumulating under there...
and I noticed that the rear window seal was actually 4 pieces... 1 piece around the top and sides... 1 for the bottom... and 1 for each bottom corner...
27 years of exposure seemed to cause shrinkage of the rubber, and with small debris creeping in that made the gaps between the rubber pieces increased...
so I put duct tape over the seeming gaps and that seemed to help for a week or so... it was pretty dry again today so I put a bunch of clear silicon in the gaps, and under the rubber inside and out near where the pieces join... I also put some along the side and bottom of the outside of the window seal...
so hopefully this was my moisture issue...
the rear cargo carpet/mat is draped over some milk crates in the garage... it has already dripped a small river in just one day...
the passenger side rear carpet is also wet, so either need to get a space heater in there or remove the carpet...
I noticed that under the rubber the metal seems a little rusty, so I think I'll have to remove that bit of rust before I replace the window...
my defroster overlay on the window is toast, and now I need a new seal, so it's an even better reason to replace the window and seal...