Unless you have a license, you'll never be able to buy freon! You'll need a manifold gauge to evacuate and add freon. You'll need to purchase silver solder and an acetylene torch to remove and reinstall the tubing connected to the compressor. You'll have to evacuate the system with a vacuum pump. A specialty tool is needed to access the charging tube on the compressor and another to pinch off the tube once the system in fully charged. You'll need a very accurate scale to add the correct amount of freon. If you have all the tools mentioned here then have at it. I wouldn't suggest trying it if you have no experience with an acetylene torch.
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It's not a diy job, I'm afraid
Unless you have a license, you'll never be able to buy freon! You'll need a manifold gauge to evacuate and add freon. You'll need to purchase silver solder and an acetylene torch to remove and reinstall the tubing connected to the compressor. You'll have to evacuate the system with a vacuum pump. A specialty tool is needed to access the charging tube on the compressor and another to pinch off the tube once the system in fully charged. You'll need a very accurate scale to add the correct amount of freon. If you have all the tools mentioned here then have at it. I wouldn't suggest trying it if you have no experience with an acetylene torch.