The A/C just stopped blowing cold air the next day without warning?

I placed a can of 134a with a gauge on the low-pressure port. The gauge read 35 and the color indicated the system was “Filled”. The low-pressure line was ice cold to the touch. The compressor pulley was turning, and the car’s rpm changed when the A/C was turned on (like the other times, nothing unusual).

A couple of months ago the drain plug was clogged to the point we could hear the condensation hit the coil fan when turning left (or right, I don’t remember). Cold air continued to come out before and after the drain plug was cleared.

Thanks for your help.