i have modified many a cooling system with standard copper and brass
plumbing fittings using no lead solder and paste flux with normal
sweating techniques.  a proper fitted and fluxed joint will just fit
together and then the solder seals it real good when heated to where it
  flows into the seams.
jimt
On Wednesday, Oct 16, 2002, at 09:04 America/Denver, George Goff wrote:

> I am fabricating a couple little doodads for my van's cooling system.
> Sounds
> like a recipe for disaster, doesn't it?  Since the joints will be
> unstressed,
> I intend to use SOFT, silver bearing solder.  Does anybody know what
> kind of
> a fit, i.e., amount of gap, is needed in a socket to make a proper
> solder
> joint?  The material is brass and the tubing OD is about 3/8" (10 mm
> to you
> younger guys).
>
> Thanks to one and all,
>
> George
>