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AC guys with reclaiming machines kinda frown on getting dye into their tools of their trade.
It is best to drain the shipping oil in the new compressor to get an accurate fill.
Lube all o-rings with whichever PAG or ester you will be using in the system.
Most cores are stored and shipped under vacuum. Listen when you remove the shipping plugs.
If possible, insulate the expansion valve. They work better and make less noise that way.
Be sure your fan relay triggers with the high pressure switch before operating the unit. It won't hurt to clean the dead bugs out of the radiator while the condensing coil is out of the way.
Vibration shortens the life of the cores so replace the padding and mounts if they are aged.
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