Okay, that still doesn't answer my question, but here's the deal. If it is being replaced because of a leak, you could probably get by with simply replacing the compressor, filter-drier, evacuation and charge.

If, on the other hand, the compressor failed internally, then it has strewn all sorts of metal debris throughout the system. If this is the case, if you do not COMPLETELY AND THOROUGHLY FLUSH THE SYSTEM, the new compressor probably won't last fifteen minutes.

It sounds as if you must assume that it has failed internally. This means, you must break EVERY connection and flush, flush, flush it again, followed by a thorough flush and then finish up with a really good flush on EVERY component in the system. If you do not adequately flush and there is ANY debris left in the system it will destroy the new compressor.

Some folks think that the filter drier will catch such debris but it will NOT. This is because there is plenty of system PAST the filter, so the filter can't catch everything. Even if it were at the compressor inlet, it is only a screen and won't filter enough to keep the trash out of the compressor.

So, the procedure will be TOTAL dismantle of all components, flushing ALL components MULTIPLE times in BOTH directions, followed by replacing the compressor, using 134 compatible o-rings with nylog lubricant or at least coating with refrigerant oil, putting in the correct amount of oil, putting the new filter/drier in LAST so that it does not start getting soaked with moisture from the air, then THOROUGHLY evacuating the system and charging.

You MUST ensure that you get ALL the flushing agent out of the system.

The last issue is the 134. These systems have very little additional capacity. Since you lose about 20% of refrigeration capacity when switching to 134, these are not good candidates for conversion. You will have so much money and time in this system rebuild, going back with R12 would add very little as a percentage of the project expense. I would highly recommend going back to R12 and if you MUST use something besides R12, don't even consider anything except 134. Don't go to any of the junk refrigerants.

Good luck,