If you get the charging kit with the gauge on it, (which I think they all have) it shouldn't be that hard to do. I did mine and it was a piece of cake. It does suck where that line is though so you have to be careful, but you can get a freon charging kit from autozone, pepboys, adavance auto, napa....you get my point. The hardest part for me was locating the connector because I couldn't believe that it would be back there. Good luck...I did mine myself because it cost an arm and a leg to get it done around here.
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