Colbyt wrote:

Most likely it has failed at the evap coil. The bad news is that new
replacement evap coils are no longer legally sold so you get screwed
into buying a whole new system. Who knows, you might get lucky and it
is leaking at a screwed connection.

I think you may be confused. In most places it is illegal for a scrap dealer
to buy a used evaporator coil - because the thieves have been chopping them
loose to sell for scrap - but a homeowner can still buy a new one.