Upon arrival, the customer wanted a second opinion on a previous company tell him the system was low and had a leak in evaporator coil. When I arrived, I checked the pressures. They were slightly low. I did leak search the evaporator coil and outdoor condenser with my leak detector, not hitting on anything. The customer decided to top the system off with refrigerant and just see how long it lasts and go from there after putting 2 pounds of Freon in his system was operating properly at this time. There’s no guarantee to how long the refrigerant will last. .