Well, if I solved my problem (exactly like yours)--and I think I did--it
came too late in the summer to absolutely prove it. But what I did was
temporarily cover the heater vents into the cabin. I was on a trip and
couldn't make needed repairs, but I did have duct tape, cardboard and
scissors. When I stopped the hot air from entering the cabin, the dripping
stopped.
I have since changed the heater valve, pulled the dash and rebuilt all the
foam sealing flaps, so hopefully it won't happen this summer.

Jim

On Wed, May 28, 2008 at 2:44 PM, John C... <Trvlr2001@comcast.net> wrote:

> Rich,
> There is a tray underneath the evaporater.
> It has two tubes, one on each side
> that exit & drain behind the rear side vents, on the D pillar.
> the tube (s) could have slipped off the tray, or leak or be clogged.
> also, the tray could have a crack, or leak somehow otherwise.
> The plastic is old and brittle.
> A helpful trick or two, I found, is to heat the tubing a little
> with an industrial blow gun.
> Makes it a lot easier to manipulate !
> Also, if the tube has a kink in it
> you can place a light weight spring
> the diameter of the tubes ID
> in the spot where the kink is.
> Removing and replacing the rear AC,
> is not an easy job, no matter how you do it !
> I used a couple of coolers and some 4" X 4" X 12" blocks I have
> to lower the AC down on.
> best of luck,
> JC
>
> -------------- Original message --------------
> From: Richard Dixon <dickd@SYMPATICO.CA>
>
> > I'm wondering if any owners have had this air conditioning problem: At
> end of
> > last summer during a hot spell, as A/C did its work, moisture started to
> drip
> > above the rear cargo area. Any ideas on repairing this problem?
> >
> > thanks,
> > Richard
> > 1988 Vanagon
>