If the description below is accurate, what is the purpose of the rear 
pillar vents?

So far we have only discussed how air ENTERS the vehicle. But of 
course, no air can come IN unless air goes OUT. This is called 
�flow-through ventilation� which all vehicles have to some degree. 
Prior to 1988, if all windows were closed, the only way air could get 
out was to exit through little exit vents located on the rear lower 
corner of the front door interior panels. These are the plastic vent 
assemblies with the little blue slide lever. These vents allowed air to 
exit the interior. Sliding the lever toward the front of the vehicle 
opens the vent, rearward closes it. On the leading edge of the doors, 
in the door jam, there are three oval holes that open into this hollow 
space of the door itself. As a Vanagon plows through the air, air flows 
around the vehicle creating low-pressure zones near the front door jam 
areas. VW engineers realized this and used this low pressure to suck 
air out of the interior of the vehicle. Air flows from the inside of 
the vehicle through the little vent at the rear end of the front doors, 
through the hollow door itself, into the door jam area, and out of the 
body gap between the front door and front quarter panel. Genius, you say
On Monday, June 7, 2004, at 07:40  PM, Automatic digest processor wrote:

> Subject: Re: heater controls
>
> If you Google it, you'll find:
>
> http://www.gowesty.com/flow-thru_ventilation.html  and
> maybe others.  M