>    I am looking for new speaker for my van.  I was just curious as to
> what the deal is with the rear speakers mounted on the AC housing.  How
> much space is behind there?  I am hoping to get 6.5" round speakers
> back there.  Has anybody else squeezed this size in?  Also, since their
> is AC components in there, do i have to worry about condesation harming
> my speakers?

Take a look at:

http://www.enter.net/~bloss/vw/ac/

near the bottom.  That shows you the back of the unit and gives you an
idea of what you have to deal with in terms of the plastic piece.

-Karl