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OldBenz:
Nothing happens "fast" with this system, except possibly defrost.
I am unsure though what exactly you mean. There are many buttons, which button do you mean?
I also don't see how the question relates to your observation of air from the center vents. The system will introduce cool air as needed, as called upon by the control unit. Whether or not the fresh air flap, which introduces outside air, or recirc flap, which recirculates the interior air, is opened or closed is pretty academic.
Gilly
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