As mentioned many times, have the system recovered (weighs present charge) and if low (likely) recharge it and have dye added. The only port is the low side and the AC needs to be running, compressor ON to measure the pressure which should be alot lower than 80psi.
If there's a dye sticker already under the hood, then have it leak checked with a blacklight and yes, a person CAN see the evaporator by removing the blower motor resistor.