On Fri, May 15, 2009 at 7:50 AM, Ken Wilford <kenwilfy@comcast.net> wrote:
> What pops it out of the end of the pipe is coolant pressure not some type of
> "toothpaste tube squeeze" effect.

That sounds plausible, but if so, then the GoWesty fix should have
absolutely no effect. If hydraulic pressure is exerting force on the
hose, which causes the hose to slide off the pipe pulling the insert
with it, then the hose and insert don't move in relation to one
another, and the GoWesty insert does nothing. If the steel insert
moves WITHIN the hose while the hose stays still on the plastic pipe,
then it's definitely NOT hydraulic pressure causing the failure, and
the GoWesty fix works. Has anyone seen a pipe with the GoWesty fix
exhibit any extrusion of the steel insert?

> �Think about it, is the clamp getting
> tighter and tighter like the toothpaste tube? �Of course not.

Yes it is. Even a simple "cheese grater" hose clamp will continue to
exert pressure so long as the compressed rubber underneath it still
retains potential energy. An OEM VW spring-type hose clamp even more
so, as it's a COMPRESSED SPRING squeezing the plastic tube. This is
simple physics.

-- 
John Bange
'90 Vanagon - "Lastwagen"
'90 Vanagon GL - "Wiesel"