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The “no radiator” bit is surprising. Heard of “air cooled” no radiator engine and heard tails of its deployment by the Germans during WW II but have never really looked into it. Even electric vehicles have radiators these days.
The 2CV is something of a French icon.
A terrible car that broke constantly but was easy to fix. The engine would run on damned near anything - including a trunk full of pig poop.
Only the French would tolerate it.