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Well changing over to 134a is a simple process and if you want to do it on the cheap here's how:
1. Assuming your system is discharged go ahead; if not take the car to a shop and get the R12 recovered out of it. If the system is clean and free from metal shavings from a failed compressor, don't worry about flushing, but you can do it if you want to.
2. Remove the compressor and drain the old oil out of it. If it is a York, you may have to remove the crankcase back plate. There may not be much oil in the compressor if the system is old or you have had a problem.
3. Refill the compressor with the right amount of PAG or Ester oil, compatible with 134a. Check on the cans for the right temperature ranges for your environment. Thicker for hotter, etc.
4. You can look up the oil capacity on the web or just ask the brickboard.
5. If you can't get all of the required oil in the compressor (if it's a Sanden rotary type), put the rest of it in the filter dryer or accumulator, condenser, etc. It will circulate.
6. Buy a kit at Autozone to convert your ports to 134a and install.
7. Buy some new o-rings and a filter/dryer at Autozone and install.
8. Evac and recharge with 134a.
I have done this on several cars, Volvos and other makes, and it works great!
Some people on the web report they never even change the compressor oil.
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