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You have to follow the proper AC service procedures. Obviously the system is empty since there is a hole.
SO, since the system is open it needs a new accumulator too. Might as well check the orifice tube for debris.
Once those things are done, evacuate and recharge to its proper charge weight, which means no 12 oz cans, those are a guess at best. You must use a charging cylinder, scales or something to be accurate.