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On 17 Nov 2005 at 7:57, Ben Doughney wrote: > On 12/11/2005, at 3:59 PM, Jim Adney wrote: > > > I've wondered about that. Don't throw away your old ones. In many > > cases, I'll bet that they could be fixed, if one had the right setup > > and knew exactly what they contained. Does anyone know what that is? > > I have repaired a Type 4 one before, it had a hole worn into one > corner, and I couldn't find a new one at the time. I just compressed > it in a vice, heated it up evenly and then soldered the hole closed > while it was still hot. > > I tested it in some water, and it opened at 60? C IIRC, which was > near enough to the 65? that was stamped on it. That worked well for a > year or so until I sold the car. I'd expect it to have something other than air in it. In your case, a liquid that boiled at 65 C would be the right choice. That would automatically give you a large change in volume at a very discrete temp. There doesn't have to be much of the working fluid in there, just enough to give the necessary volume change when it turns to a gas. -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~