The compressor for certain IS running? What do the line temps feel like? That is the suction and discharge lines at the compressor. any frost or condensation, or "any" cooling feel around the lines at the firewall? My first thought is that the metering device is plugged (AKA the orifice, cap tube, TXV), and that can also be ICE, AKA water in the system.
If this is a TXV system the TXV might be just plain bad, EG ruptured pressure diaphragm/ temp bulb