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Re: AC compressor, new or remanufactured?
Always buy a new drier. Its the little can and it has a dessicant bag in it. Should be very inexpensive and a necessary thing.
Converting refrigerants should always include a complete flush. You should be able to buy a kit to do it at home if you want, but it involves a solvent that you introduce into the system and then push it through; some with an air compressor, and some (rarely) by running the AC system.
The biggest reason is that the R12 system probably used mineral oil as a lube and the 134 system should have Ester or similar lube. Those two don't play well with others. Most of the oil stays in the compressor, but its best to flush it out anyway.
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