I remember a few years back when one of the folks from the Magnum PI fan
club
came on this list to implore one of us to buy one of these vans (there were
several) and save it from the scrapper.  I thought that van was aircooled
though.  Next time I watch the show I will pay more attention.  Maybe they
started out with aircooled and then went to watercooled in later shows.   
Thanks for sharing.