While the AC is running pull the black wire off the control board (be very careful not to brake or short anything). If the blower stops - it's OK.
There are other things to check: first of all the freon pressure, the air filter. If you don't have the gauges touch the thick copper pipe - must be sweating and dripping condensation. If it's not - there is the sealed system problem.
When testing keep the FAU closed.
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