I'm pretty sure that the main purpose of the 88 & later rear window
vents was to eliminate the exhaust vents that were previously in the
side doors. By doing this, they then sealed up the area at the front
edge of the doors, which eliminated considerable wind noise. They had to
put cabin exhaust vents someplace, the back of the windows was a pretty
good place.
Al Brase

Doug F wrote:

>Tim,
>I'm one die hard vanagon owners who (did have) too much time  and did the
>slider transplant to my bus.
>By using the standard GL middle sliders you get about a 5 inch opening
>window. I think the westy still has that much window outside the closet so
>you could still get both sides to open up.
>
>When I did the work I wondered how "worth it" it was going to be, I am happy
>to say that I do use them all the time when in the back. With a bit of
>screen you can have cross ventalation for sleeping.
>
>
>