At 09:15 PM 3/24/2009, John Bange wrote:
>Looking at that, I feel I must amend my theory slightly. I suspect
>that it's not just cooling system pressure, but also that the clamp is
>squeezing the soft tube, pushing the steel insert out, like toothpaste
>out of a tube. That fits better with the nature of the GoWesty fix, I
>think.

There's thermal (hard/soft) and presssure (swell/shrink) cycling
going on, too.  Somehow the insert has to travel even with the clamp
squeezing on it, because at the start, the clamp is in the middle of
the insert or even toward the outer end.  Maybe VW used special
metal-repelling plastic left over from the flying saucer program.  :-)

d

  --
David Beierl - Providence RI USA -- http://pws.prserv.net/synergy/Vanagon/
'89 Po' White Star "Scamp"