This should be a fairly straightforward job. I don't think you really need to be as strict as called out, but it would never hurt. I suggest that you remove (if not too difficult) the evaporator and condenser and drain the oil out of them. I also suggest replacing the hoses.
Some reasoning:
In an R-12 system, the oil circulates with the refrigerant thus lubricating the compressor and any other moving parts - like if it uses an expansion valve. In an R-134a system, the oil also needs to circulate. However, in the R-12 system, the oil used is a mineral oil, and in the R-134a system, either an ester oil or a PAG oil is used. This is because the mineral oil will not circulate in an R-134a system. So, they use a different oil that will circulate. Unfortunately, the oils used with R-134a have an affinity for water, and will absorb moisture from the air. The hoses used with the R-12 will allow R-134a refrigerant to permeate them. For this reason, barrier hoses are used with the R-134a.
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Today's Featured Article - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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