climbabout

Quick question - I am diagnosing my ac in my 64 - trying to get a handle on high side readings that are too high (about 300 on a 75 deg day). From a previous thread I had on this Powershift and others knowledgable about ac tell me it's probably air in the lines or a clog in the inlet screen of the expansion valve. Just picked up a new correct delco expansion valve today and I don't see any screen in it. Can't find one on the Napa site either. Anyone have a pic of what it looks like and where it goes?

Thanks,
Tim