So with your low milage I imagine you have not yet replaced your serpentine belt, a combination of that and either the idler pulley and or belt tensioner is most likely.
Your idle sounds low, controlled by the ECU I believe the in gear, at operating temp, is closer to 750 RPM's.
As for the A/C, other then the normal setting be it on auto matic or not, there is nothing else you can do to speed up the air flow. Are you sure your fan setting is on high?
Mike
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