Hi Myron,
Tubing benders which can bend tubing over 3/4" OD tend to be in the $2000 -
$20,000 dollar range.  Conduit benders cannot do what would be needed for
coolant pipes.  I happen to have a proper bender because that is what is
needed to build the Vanagon cargo racks I make.
To see a rotary draw bender try http://www.ercolina.com/WEBTED/INGMAIN.html

Its not something that you would purchase for just one, or even a few jobs.

On vehicles where pre-formed coolant hose is Very expensive or unobtainable,
I will go the junkyard and buy a whole bunch of pre-bent hose and metal tube
off various vehicles.  I will then cut it up and splice it together to suit
my needs.  Use metal tube and hose clamps to join rubber hose together.
With a combination of bent metal tubing and pre-formed rubber hose elbows
and angles, you can come up with anything you may need.
I've never done this with a diesel vanagon though, so this may be of no help
to you at all.

Good luck

Gary Lee
http://www.telusplanet.net/public/gary2a/rack/vanagonrack.htm

----- Original Message -----
 > plumbing.  I have a "rotary draw" tubing bender with mandrels
> for many sizes
> > of tubing.  I made up sections of tube with bends.  You could
> also miter
>
> > Gary Lee
> > Calgary
> > http://www.telusplanet.net/public/gary2a/rack/vanagonrack.htm
> >
> Hi, Gary.
> What is a "rotary draw" bender? Any place on the net that I could
> see what it is?
>
> That is a pretty nice looking rack on your web page
>