HVAC Helper
The diagnostic helper is incomplete so it probably won't tell you what is wrong but it will evaluate the system.
It will give you values like a target Superheat & TD across the evaporator coil to look for.
It will also evaluate the system pressures & temps and alert you if any problems are found.
The more information posted the higher probability of a proper diagnosis.
Indoor wetbulb and outdoor dry bulb temperature is needed to determine proper superheat.
Outdoor temperature is needed to determine proper head pressure range.
Indoor dry bulb temperature is needed to determine proper suction pressure range.
Both suction pressure and line temperatures are needed to determine actual superheat.
Both liquid pressure and line temperatures are needed to determine actual subcooling.
Indoor wetbulb and indoor dry bulb temperature is needed to determine proper temperature drop across the evaporator coil.
Both indoor return and supply temperatures are needed to determine actual TD across the evaporator