Upon arrival customer stated that ac unit for upstairs had been struggling and not cooling efficiently since Monday when hot temperatures started. After inspection of system found that TXV metering device failed. System is not regulating the refrigerant properly and possible of build up inside the line and ac unit. Advised customer that I can clean coil and see if system would take refrigerant and start cooling properly. Only had a 11 degree split. Cleaned coil added .8 oz of refrigerant to get to manufactured of 16 degree sub cool. Noticed that system did not change and metering device continued to bounce around with refrigerant pressures. Gave customer estimate to change out evaporator coil with new metering device or update ac and coil. Customer would like to speak with install supervisor about updating ac and coil before making any repairs to system at this time. Based on our findings today, it might be time to think about getting a brand new system.