Completed diagnostic. Found 21 year old systems. Upstairs not cooling well. Has very dirty blower wheel which decreases airflow and puts extra strain on blower motor. System has no water safety attached so if drain line clogs it will over flow into attic and cause water damage to house. Outdoor unit has very low pressures. System is leaking. Capacitor outside is weak and contactor is putting meaning it is not getting a reliable connection when system turns on. Suggest replacing system due to age, efficiency, and cost of repairs. Customer wants to fill it with Freon for now.