Hi Tony,
Thank you for the explanation, that all makes sense.
So there will be a vent hole in the simple condenser, maybe in the cap, and the condenser with the tube which will end below water level in the can to minimise evapouration.....
Anecdotally the drivers waited until they saw water coming from the condenser, (which is alledgedly why it was mounted in front of the driver) at which time they pointed the truck into any wind, stopped, turned the engine off, and waited for the engine/radiator to cool.
So it appears that they experienced water venting from the condenser.
That sounds like a lot of water coming from the radiator in order to fill the can, although I presume the condenser would be 1/3 or 1/2 full with water anyway to have a cooling effect. Some condensers show water staining down their sides too, suggesting venting.
Also there seems to be 2 different sizes of cans with distinctly shorter/fatter and skinny/taller cans. I haven't checked to see if the size/shape relates to the simple or vent tube designs, mostly because of the poor quality of most of the photographs.
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