There is a great article at Samba.com titled "Engine cooling & cabin heating system tutorial" under 68 and later bugs. It explains how the two systems work and how critical using the right parts are.
Howard
Got a link to it Howard?
http://www.thesamba.com/vw/forum/viewtopic.php?t=434051&highlight=proper+air+cooling
Thanks Bob, I don't know how to do that stuff!!!!!!!!!!! (yet)
Howard
Great article !!!