On arrival system was off. I found the system low on refrigerant and leak searched the entire system. I was not able to 100% leak search the evaporator coil but I was able to leak search the entirety of the outdoor unit. No leak found on the outside unit or on any of the reachable portions of the line set. Recommended replacing the evaporator coil and recharging the system. When I left the system was back on and cooling but I advised the Tennant that the coil will freeze back up again.