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You're welcome. My Dad started driving in 1939 and was one happy guy when he moved to Texas and could also afford a new car with a SEARS underdash A/C unit (a '54 Ford). From him I learned to "set" the vents . . and never move them again.
I agree with wanting to flush out the interior stale air, but have found that it can sometimes work and sometimes not depending on both local traffic/route, plus whether a dry or humid climate. What worked for me in 108F Dallas is a bit different than 94F Corpus Christi with high humidity (and, even among humid areas it can differ, ha!) I sometimes crack a rear window to accelerate airflow, but only if moving steadily.
It's worth a little trouble to find the cabin exhaust vents to be sure they're clean; no torn weatherstripping, etc.
If the system is a few years old, have a shop hold the system under vacuum (500-microns; or 28") ALL NIGHT. Sometimes a small leak will show up this way. A thirty minute check is only JUST adequate. There are more details to learn for a Florida boy on some of the mobile HVAC sites for best performance.
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