Hi Gerry

I simply took an old computer fan I had laying around, and mounted it to a piece of aluminum that had a slight angle bent into it. The fan sits right above the top of the rear seat, and is angled upwards (after some experimenting) to cover the widest area of the rear window. I actually stuck the bracket down using a magnet I salvaged off the back of an old speaker (no holes in my car, please). Yes, it looks very ugly...

In the future, I will likely mount a pair of 2" fans instead of the single fan, which I think will defog the entire rear window even more quickly. Scavenging cabin air works just fine for the task.

Oh, and make sure the inside of your trunk is dry, (and your car) is as dry as possible; it makes the defogging happen that much quicker.

There are a pair of rectangular holes in the floor of the rear parcel shelf, that I believe are for an optional factory or dealer installed defogger. I expect you could scrounge a set of vents from the junkyard that would be a close enough fit, and mount a blower box inside the trunk. It would have to pull cabin air from the cabin-to-trunk air ducts below the rear roof pillars.

I have seen small oscillating fans for automotive use a few years back; one of those might work well if you could find one (JC Whitney?) although they remind of something you would see in a Cheech and Chong movie being used to blow the marijuana smoke away from the windshield ;)

Bill