When it's hot out, I often struggle with various ways to get the most
air flowing through my 86 westy to keep me cool while driving.  There
seems to be strong low pressure outside the front doors, so opening
the vent or rollup windows seems to want to suck air out.  The side
slider windows in the back are pretty small and I'm not sure if air
wants to come in those or not due to relative pressures in that area
of the van.  I have driven with the skylight open and quite a bit of
air seems to come in there when the front windows are open, despite
its rear facing orientation.

The back area of the van seems to get very little airflow and gets
hotter and hotter, especially on a sunny day.  I've thought about
getting the late model rear side windows with the vents to upgrade my
86 which has the front door vents.  Do those rear window vents make a
big difference?  What are your hot weather driving tips?

Edward