I posted some pix on the O-ring replacement process.....not hard to do at all, 10 minutes with a 10mmm wrench but you have to contort a bit to reach the compressor-side block. Before you do that, do as suggested above......take it to the dealer for diagnosis......my local stealership only charged me $100 for check, purge, fill, and checkup a week later. You can do it yourself for less than half that if you want to spend the time but $100 ain;t so bad.