Windows fogging up...BAD! help

[Dan Bozga]

Looks like this place has been pretty dead lately so I'll try to send this one out:

I finally got my 200 road worthy (still having overboost problems, but the brakes are pretty much fine now) for this snow blizzard here in MD. My heavily lowered S4 on ultra high perf. summer tires wasn't stopping very well so I had to enlist the 200 for its ground clearance and all seasons.

Anyways, a huge problem I'm having is that the windows are fogging up VER badly. So bad that I can't fight it with the heater. I've tried hot, cold (as cold as it can get with a busted AC compressor) and it makes no difference. I wipe the windshield down and it comes back almost instantly. It's so intense that there are water droplets running down the inside of the window. Now I've had a heater core issue before with my very first Audi way back in the day ('86 5000CS quattro) so I kind of know what to look for. That one was leaking onto the passenger floorboard and I had to take like half the car apart to fix it(I'm sure you're aware of the joy this involves).

I'm not certain what there is that I can do for at least a quick fix. Do these cars have a way to get fresh air inside or change it to "circulate"? I never saw that feature so don't know how it can be done. 

Any help is greatly appreciated because this issue makes it pretty much undrivable and I need this car right now.

Thanks!


Dan B.