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I think most of what is involved is:
1. Replace receiver/dryer.
2. I think O rings have to be replaced with compat. ones.
3. Totally flush the system to get out the old oil.
4. Quite often hoses need to be replaced with barrier hoses as the R134 molecules are smaller than R12 and can leak through the pores on some hoses!
5. Charge fitting is changed or an adapter is screwed on.
6. Fill with R134 compat. oil.
A friend works for Wynns Climate Systems and he was telling me that when they were first experimenting with with system retrofits they would charge it up, run it and come back in a few days and all the juice would be gone. He said they drove themselves nuts looking for leaks until they realized it was actually leaking out through the "pores" in the standard rubber hoses!
I'm not sure what shops are charging for R12 nowdays ($25-$30/pound?) but if all you need is a evac and recharge I wouldn't think it wouldn't take much more than 3 lb to recharge.
I'm just gonna keep putting R12 in mine (I bought 2 cases when it got up to the ridiculous price of $3.29/can and still have one case left) until something major needs to be done then probably will switch it over. I still have two vehicles that use R12...
Have fun,
Justin B.
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