Ester oil is what is usually used in retro-fitting like you are doing there. The expansion valve should be okay with 134a if it was working with the old R-12. I would put some dye in too, you can be sure it will be leaking out somewhere over time. Be certain to pull a good vacuum on it for 15-20 minutes at least, you will need a pump for that capable of getting a 25-30 vacuum reading. If it was me, I would try the coversion before replacing the hoses and seals, thats just me. It just wont cool as good as it did with R 12, and the pressures will read a little different, but it should work.
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Today's Featured Article - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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