Thanks for the ideas.

With respect ot moisture draining into the cabin, I've looked carefully for any signs of this as I've been working to get to the recirc valve. No sign of moisture at all. This is not surprising, since I have not driven the car in the snow or rain since I bought it in January.

With respect to using the A/C to help with de-misting, even with the A/C and fan running full tilt and the vents set to defrost, we couldn't keep the windows on the shaded side of the car mist free on a clear, sunny 30 degree day when the only apparent source of moisture would be from what my wife and I were exhaling.

I'm really convinced that absolutely no outside air was flowing through the cabin to reduce the humidity.

My next step in trying to get to the valve is finding a source for the extraction tool(s) needed to remove the radio so I can gain access to the screws that hold the trim panel which may cover some of the screws holding the dash top cover in place. I've got some extraction tools for Blaupunkt radios that are almost like the tools shown in the manual, but I'm fearful that if I insert them, they may be captured but not release the radio.

- Bill