If your temperature switch is all the way left on cooling, that activates maximum a/c which is outside vent closed, full recirculation of cabin air, and high speed blower (regardless of where the blower switch is). This is to cool the cabin down fast if you just jumped into a hot car.
If you move the temperature to the right slightly towards heat, the system should come off maximum a/c, open the outside air vent, and the blower should return to the speed setting on the blower switch.
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1973 GTO 400 4-spd
1973 LeMans GT
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