Customer said ac was making a bad noise and the coil inside froze up. Found that the capacitor outside is out of range and that the system is low on refrigerant. These issues would cause stress on the compressor outside. Also the low refrigerant caused the coil to freeze up. Most likely cause is that there is a leak in the system. Would need to perform a leak search to find. System is from 2011, out of warranty. Customer opted to not repair anything and get a quote for a new system.