Preformed cooling maintenance. Tested start and run amps on compressor and fan motor. All tested within manufacture specifications. Tested contactor ohms we found that the contactor was testing high at 25ohms. Noticed the main drain line was clogged. Also system did not have safety switch or blowout valve. Offered a new contactor replacement, blowout valve, safety switch and blew out main drain to client. Client went ahead with the repairs. Changed filter for client 20x25x4. Unit was cooling properly upon departure.