snip
> As far as the vent at the rear of the door with the blue lever, that is not
> connected to the vents for the rear.  Those doohickeys are supposedly for
> "fresh air circulation."  Our vans are supposed to be airtight.  VW was
> known for that.  So theoretically, if you want any fresh air coming into
> the van, you need to provide an outlet so you get a flow-through kinda
> thing going.  That's what those flaps do.  You open them and you supposedly
> get better ventilation as the air coming in doesn't have to "work as hard"
> to get in.
> 
> That's the theory behind them anyway.  Note that the air-cooled Buses also
> had those vents in the doors.
> 
> Sean
snip

Removed "the vent at the rear of the door with the blue lever".
Used a flashlight with a small mech's mirror to brouse around.
Can find no air passages to these vents.
Yet air flows!
Is it leaking through the window seals and door handles?
Larry