I had freon added to my AC last summer but the service technician was having some kind of problem (wasn't getting temp or pressure? drops??) with what he was measuring at the outside unit. He later came in and looked at indoor unit and found expansion valve on outside of it. He said it needed replaced.
Part was backordered but never arrived. I turned the AC off because it was not producing any cooling. After the valve thawed I turned it back on and the valve worked the rest of last summer.
This spring the valve is icing up again. I turn off, thaw, and back on but it keeps icing up.
Is expansion valve icing up because the valve is bad or will it ice up if I need freon again?