The rear unit is plumbed in series with the front unit as far as the
coolant flow, most likely.

Unlikely.  Remember how AC works: it is not pumping cold fluid around,
it is pumping HOT fluid around.  The phase change that occurs at/after
the expansion valve sucks the heat out of the environment.  After the
phase change the coolant is cold, but has little remaining heat-carrying
capacity.  My read on it is that there are TWO expansion valves, all is
is wired in parallel.  The compressor/condenser is sized up accordingly.

But look it up for sure.

-- Jim


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