Hi, John:

Thanks for your response. I agree with the door vents as you
described. Though the door vents on my 91 GL have no levers
for "opening" or "closing".

The rear vents I was referring to in my post to the List are
the vents that are integral with the glass of the rear
side-windows. These vents only occur on the late, late
Vanagon's from what I can tell.  I'm not referring to the
vents that are integral with the body metal to the rear of
the rear side-windows.

I was actually hesitant to make my previous post, as I
couldn't re-reference the literature where I read the basis
for my post. But there is literature, either in my owners
manual, Bentley, or elsewhere that indicates the vents that
I'm describing "suck" air out of the interior of the
vehicle. But, alas, no documentation at the moment.

So, I guess the questions about these "vents" will continue!

Thanks again,

- - George Chapman, 91 GL
    Lake Almanor, CA