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Technically you're supposed to have the AC R134a evacuated and recharged by a certified technician because of environmental concerns.
BUT, I'm a cheap dude so I went to Walmart and got the Intermatic Recharge and Sealer kit including a pressure gauge. I spent less than $50. I charged it last Spring and it's been okay but I haven't used it recently in the winter.
You've got to be REALLY careful not to overcharge the system because that'll screw up the system.
Another alternative is this product call Cryo-seal. It's supposed to stop pretty large leaks but it's more expensive and I think you need a technician to do a pressure/vacuum check to see if it'll work on your leak.
Do a search on this site, there was a bunch of posts last summer.
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