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Reply to "Mystery Tube"

Dear Percy,

          I believe that you have found the remains of a later factory improvement to the cooling system, which originates from point near the top of the factory radiator and was supposed to efficiently vent trapped air.  The air ended up at a point on one of the two tanks ( I can't recall specifically--it has been a long time).  

          As I understand things, it didn't work all that well, which jives with the my experience.  I suspect that most of them are disconnected due to their poor function and the use of more modern radiators without the fitting. 

         Warmest regards, Chuck Engles

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