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On 23 Dec 2005 at 20:54, Keith Park wrote: > The pre-66 heaterboxes don't have that opening... they are just like the > later ones except the valve assembly is devoid the vent so if the heat is > off no air moves through the exchanger. On the early HEs the valve was actually not part of the HE. The valves were on the mixer boxes mounted to either side of the tranny nose. Is that what you guys are talking about? I had always assumed that the early mixer boxes had the relief valve on top of them, but I've never worked on any of those. -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~