Arrived and system was iced on outdoor unit and partially in the evapaorator coil. Performed AC precision tune up. Clean and tune up AC; cleaned condenser coil, checked all outdoor electrical components, tested indoor air flow, checked refrigerant levels, and tested overall AC operation. System is low on refigerant. Charged unit with R22 to acquire proper charge. Added leak sealant to attempt at stopping leak. Leak sealant is it a gaurentee and ,a unit hold charge. Replacement Is being looked at. Will have home advisor follow up with updated quote.