Originally Posted by
rselby
You don't need to get an Embracco, a Copeland or Tecumseh will work too. More than likely it's a 1/3 HP CSIR compressor. I would probably use R-134A, but in reality MP 39 will work too, so that's up to you.
I would definitely replace the cap tube right off the bat and use a Sporlan C-032S CAP drier, not the desiccant bullet type drier. Drill out the old compressor and see how much oil is in it and what it looks like, flush the condenser coil. Push some dry Nitro through the evap and line set and see if you get any junk that comes out. I pull the cap tube and blow nitro through the evap.
Since this was an R-12 system originally and then retro fitted to R-134A I'd bet dollars to doughnut holes your cap tube is the culprit, especially if it has the desiccant bullet type drier installed.
The most common compressor failure of S/C units is a plugged condenser coil, the heat the compressor creates cokes up the oil and/or breaks up the desiccant in the bullet style driers which plugs the cap tube.