Rio Linda California heating AC service AC maintenance AC diagnostic residential and commercial hvac equipment. Trane 3.5 ton split system Diagnostic AC system running visual inspection condenser coil plugged solid. restricting airflow causing system to run hot and overheat. inspection of system found refrigerant charge low. most likely caused from refrigerant leak. Repairs for system to operate chemically cleaned condenser coil. charge system with our 22 refrigerant. Recommend performing leak search to determine cause of leak and fix appropriately. Due to type of refrigerant in the system and age of unit other option is adding sealant to system to try and seal refrigerant leak sealant is not a guarantee. Repairs for AC system completed at this time Chemically cleaned condenser coil and charge system to manufacture specifications. Added system sealant to system and dye if sealant doesn't work we'll be able to come back at a later time and look for leak.