I was going to put one of those units under the bonnet and run two air ducts back to the dash..
I have collected air vents from a few cars...
I would have used the aluminium tubing as used on beetle engines or similar..
I've only ever seen air con compressors on Beetle engines,
I've never seen one on a type 3 engine..
In the US, most VW engines have idler pulleys to keep the belt tensioned..
so, nothing is impossible.. just a darn sight harder..
I have seen a beetle engine with an alternator sitting next to the generator and the one belt going round them
the generator still had the fan on the other end...
some of the set ups I've seen, the belt only sat in the pulley for say 90 degrees...
I didn't think the belt could work unless it was in about half way round the pulley -
idler pulleys do help in those situations..
cheers
Lee 68Autobug
http://community.webshots.com/user/vw68autobug