Didn't the late model rear side windows accomplish this?

http://images.cars.com/phototab/DMI/103836/004289.jpg

http://www.van-cafe.com/shop/images/USED.REARWINDOWS.jpg

Or install rear sliding windows like the SA vans.

BenT
sent from my electronic leash

On May 2, 2012, at 11:46 AM, Steven Shelton <shelton4@GMAIL.COM> wrote:

> A few years ago I bought a rear hatch lock extension bar.  It came in a bag
> with text in German so I didn't know that it wasn't recommended for use
> when driving (making it of very limited usefulness if you have the rear
> screen).  With the extension bar in place while driving with the windows
> open, the air flow through the van was smooth and laminar, far superior to
> the buffeting we get normally. It made driving in in a Georgia summer
> without AC bearable.  I confess that I have occasionally used it while
> driving since discovering that it is not recommended, but exhaust gases
> sometimes leak in.  I would like to come up with a way to achieve this air
> flow without the complication of carbon monoxide poisoning.   Has anyone
> come up with a modification that did this?