If yours has been open to the atmosphere for more than a day or so, the desiccant is likely to be not effective and the drier will need to be rebuilt. I've got another drier currently at Classic Air to be rebuilt.
I just got off the phone with Classic Air about my drier (shipping out this Fri - ye haw) and was discussing with him your drier. He said anything more than a couple of hours with the lines open and the dessicant bag is no good. Just some info to pass along!
