AC is acting up can anybody help me diagnose the issue

Car
2011 FX 35
Name
Camilo
AC is acting up can anybody help me diagnose the issue, it will blow cold occasionally and then it won't. I have been trying to hold off as long as possible but I cannot wait any longer my wife has had it. Any thoughts would be greatly appreciated.
 
There’s also an “ in-cab” breathing temperature regulator/ reading part of the system that’ll get clogged with dust after a few years.

Look by your right knee, then blow the dust out.
 
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