Found both main and upstairs units frozen. thawed out both. main floor filter was completely impacted; freon to that unit ok. txv to upstairs unit was throttled down in mostly closed position. opened up valve by warming bulb now wide open and flooding coil-252/77 30 subcool 26 superheat. the apex circuit of the evaporator coil has never sweated back since it was installed. recommend replacing coil; Goodman ac unit for upstairs is brand new. replaced blown run capacitor at the barn.