JP, behind each of the AC vents is a sort of square foam dougnut that guides air from the evaporator box thru a horribly mismatched opening in the dashboard to the actual vent. OEM ones have usually turned to dust by now. It's easy to replace if the dash is out, but its possible to do with the dash in place as well. It makes a measurable difference in cool air quality. You can make your own or most vendors have them available cheap.
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