3A Clizen's head office is located in Incheon with automotive test and inspection equipment at our Doegu and Changyoung production facilities. Our automotive heat exchanger & automotive compressor parts testing and inspection equipment is able to meet the toughest requirements and expectations for measuring and monitoring worldclass automotive compressor pistons, automotive condensers, ac compressor clutchs, automotive pulleys, crank shaft pulleys, field coil assembly, heater coils, copper heater cores, swashplate assemblys, clutch pulleys and automotive evaporators.