Brother of The Benz, fredsegal
You've been given all of the information about what has or will happen.
I'm not as knowledgabile as others on the subject, but I've never seen moisture visible in the sight glass. The drier, if it is performing will contain it in the desiccant or the molecular sieve. Beyond that it freezes at the expansion valve orific, and there would be no cooling.
I would suggest you go to a service station and have it check out.
If you are concerned if it has beenh converted to R-134A, look at the service ports for retro fit fittings, one red and the other blue.
Happy Trails Beep Beep from The Spiderman in Houston!!!