Do a search for foam coming from your air vents. This will explain to you a very, VERY common problem that results in the inability to direct the air anywhere specific.... meaning it's always being distributed everywhere..... resulting in very low air flow anywhere.
I'd think it very likely this is your problem. You may not see foam bits simply because it's all gone!
It's really unlikely it's anything to do with refrigerant or compressor, as that has zero bearing on air volume, only air temperature.
Let us know what you find?
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