This sounds very much like a 'conversion van' unit I'm running in my
1980 TD camper.

I bought it for $35+/- from a u-pull it and I've seen many more units
at the junkyards..
they bill you for 1 blower motor and 1 heater core. wiring is very
simple, and I doubt it'll leak ala vanagon rear heater.   it's also
shorter in height then a vanagon rear heater (which fit perfectly in a
beetle opposite the battery under the back seat for those beetle engine
conversion minded).

it has 1 core, and 4 hook-ups. 2 for hot water heat and 2 for the AC
system.

I'm currently running mine heat only, AC lines not run/connected.

it has a 2 blower squirrel cage fan, and moves anlot of air.

From:    Jeffrey Schwaia <jeff@VANAGONPARTS.COM>
Subject: Re: Under Seat AC

I thought this was a strange animal.  I'll have to take a few pictures
for
everyone's perusal.  Personally, I really liked the simplicity of this
unit.
It fits nicely under the rear seat/bed, but only has two outlets for
cool
air (and two inlets).

Cheers,

Jeff
www.vanagonparts.com