As explained to me by the "Coronal" the nuggets are the last part of a rooster to go over the fence...
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The "Coronal"? Perhaps you meant "The Colonel"?
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You really can't just slap R134a into an R12 system without refitting the capillary tubing's length & internal diameter (size) . Plus he should have at least flushed the system to remove any old mineral oil & installed a new compatible filter/dryer too. ( as the original system never had a filter install, only a small filter-sieve/screen on the outlet of the condenser coils return line, which is often plugged & causes mischief and misery).
Good luck
Would the 55's original evaporator coil handle R134a okay, as long as the rest of the system is properly set up for it?