air exit.

forward open, rear back. If it is open I can feel air exiting when
driving.

later vans had the exit vents in rear side windows and added rubber
seal on front door which I think reduces road noise but blocks the low
pressure exit route for air that is employed by the early system.

alistair

On 28-Feb-11, at 10:06 AM, Don Hanson wrote:

> I haven't been able to figure out exactly what these little sliders
> are
> supposed to do in my van, yet.  I'd guess, since they are blue in
> color they
> have something to do with outside or fresh unheated air.  I am
> speaking of
> the vent panels in the rear lower corners of the front doors in my
> normal
> (non-AC non-Westie) 84.  They are about 10" long and 3" high, with a
> blue
> sliding door/lever and a louvered grill.
>
>  Open or closed, I can't detect any difference in air inside the
> vehicle.
> The Vanagon heating and ventilation system, it's controls, it's basic
> design, the way the heated coolant is routed and the valves that
> direct it
> all around....it all seems a bit weird to me...It does work,
> somehow, when
> all is well with the valves and cables and hoses, but you almost
> seem to
> need an Ouiji Board to un-ravel how they were thinking when they
> built this
> system.
>
>  So what the heck to those slider's do?  I am guessing they may be
> an inlet
> to take cabin heated air into the defrost?  Or perhaps something to
> do with
> the vents on the dash corners?
>
>  Anybody?
>  Don Hanson