Came out for diagnostic in Cameron Park. Unit is a York condenser on back of house. System is R22 and has no refrigerant in system. Found cause of leak at condenser. Condensing coil has corroded and broken open on bottom of coil. System leaks more that 15% annual allowed rate for leakage of refrigerant. Informed homeowner that Senior comfort advisor would be out to asses the equipment to give a fair and accurate price to repair or replace system.