early Barracuda interior ventilation

[wheelsport]

I recently installed air conditioning in my '65 Barracuda. While driving on a 95-degree day, I found that the AC had a hard time cooling the interior. This raised the question of how the interior ventilation was designed to work in the Barracudas. Below the rear of the back window, there are vent slots covered with rubber flaps that I suspect have something to do with airflow. Can anyone explain how the ventilation system is supposed to work?

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[Dana67Dart]

It doesn't look like your copy and paste worked properly

 

[YY1]

Yeah- TERRIBLE cut and paste.

My OEM but converted to R134a AC in my 73 Satellite blows 48 degrees or lower but because there's basically zero insulation and questionable sealing, doesn't do nearly as good a job as my newer vehicles.

It's WAY better than not having it though, in central FL, where it's currently 94 degrees and 65% humidity

 

[dr dodge]

especially in sunny places, the roof gets very hot
the little fiberglass (OE) insulation is not super effective
I plan on using shaped 2" pink foam for the ceiling,
and making it the head liner, too
sun beating on the dash gets it pretty hot, too

it's hard to get an old car as tight as a new one,
there weren't that tight to begin with