It appears as though the system has an internal refrigerant restriction. The refrigerant changes from a liquid to a gas at the metering device, that could be a thermostatic expansion valve(TXV) or a fixed orifice. As the refrigerant changes state it also changes in pressure at the metering device, in your case it is too great of a pressure drop, I would guess that some debris is plugging the screen if it's a fixed orifice or if it is a TXV system, that device may have failed. With the low pressure in the evaporator, the system will create ice on the coil, the ice will further lower the low pressure and raise the high pressure, at some point you will get no airflow from the vents due to solid ice on the evap coil.
Last edited by 78buckshot; 05/11/2023 11:13 AM.
