Sounds to me like the air intake behind the grill is blocked with something. Maybe a wasp or rodent nest. I used to take my grill off and tape cardboard over the intake every winter to minimize cold air flow into the van, occasionally forgot to remove it when warm weather came back around. It behaved much like yours.
Don

----- Original Message -----
From: mark drillock <mdrillock@COX.NET>
Date: Saturday, July 10, 2010 7:32 pm
Subject: Re: A/C? Pfui! Need a good fan

> If you set the levers as I said and got nothing out of the dash end
> vents while driving 60 then there is something very wrong in your
> dash.The vents have no other purpose in your year. There are hoses
> from the
> heater box to each of the end vents. Are they present and connected?
>
> Mark
>
>
>
>
> Mike "Rocket J Squirrel" wrote:
> >
> >
> > mark drillock wrote:
> >> At 60 mph?
> >
> > Yeah. I made special trips out on the stupid parkway today just
> to test
> > you guy's dash lever suggestions.
> >
> > At no time was there air from the dash end openings. Depending
> on how
> > the levers were set, I could get a mild updraft from the defroster
> > vents, not enough to feel on my head or face; or a mild breeze
> against> my right leg, a mere draft.
> >
> >>
>