I think you have hit the nail on the head Peter, re the cabin recirculation system.

With the best possible endeavors the air sucked in through the current design will always be above ambient or warm to some extent. The engine heat is always going to warm the heater box air paths, and then there is that heater matrix to deal with. And it’s not going to be possible so get sub-ambient air without a cooling device either.

But another thought...thinking

Howerver it might just be possible to recirculated ambient air within the cabin, if you were prepared to sacrifice the radio space. You could always mount a bank of PC fans across the radio aperture to stir the air. That would pull in ambient cabin air from the existing heater box outlets and blow it forward. Little risk of warm air being pulled through the heater matrix as it would most probably just short circuit, pulling air from the least line of resistance through those outlet vents.

You might even be able to mount something like this in the radio aperture, although might not be so powerful.

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PS – Do you really need a radio in a Morgan. I’ve never ever used mine grin2

Roger
2011 Plus 4