Take the cover off the main unit, and inspect the vent openings and the divider in between the intake and plenum. It is extremely common to have the duct openings partially blocked, taped all wrong, the divider out of place.
There are several ways to increase the flow, I did some modifications suggested on YouTube and elsewhere, and my A/C works 200% better.
I added a lot of pink styrofoam in suggested places, and it not only has much better flow, but is quieter.
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Doug and Patience and Shelby the mutt
2015 Crossroads Sunset Trail Reserve ST26RB
2013 Ford F-150 3.5 EcoBoost XLT Supercab 4x4
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