Nate was heading for something about moisture. When you soldered the dryer on, did you pull a good, long vacuum on the unit? This is the reason for a vacuum, moisture can travel around the system and settle at the cap tube and will freeze up causing a blockage. The other thing I'm interested in is what kind of solder did you use? If you used soft solder such as acid core on a role, this could have done the same thing, blocking the cap tube. Either case, your unit won't function properly. I would recommend a good set of guages and a thermometer. You really need both to do a good job! A thermometer is a lot cheaper than a box of busted bottles that froze because the stat didn't shut the compressor off at temperature!