hi corbin,
gave you a long story.

short version, but question first: have you done anything yet?

don't/never use pag with r12 oil. use ester oil, which is compatible with r12 oil (mineral oil). pag oil is not.

if you change the compressor that has pag oil, then everything else needs to be flushed with ac flush liquid cleaner to flush out the mineral oil.

you will need
1. r134 suction port fitting, volvo's fitting connects to the drier (i have one i used, and not needed).
2. new drier
3. new ac o-rings
4. ester oil (add correct amount, shown in the instructions)


best to have
5. not available (but i have the volvo upgraded to fit -90 models, used but still good), but change evaporator, because larger pipes to accommodate different size molecules of r134 than r12 (trade name, freon).

6. new expansion valve

7. ac compressor may be still good, but can be replaced during retrofitting.

8. add an electric fan to the front of the condenser. (adding a fan instructions can be found anywhere. 91-93 240s have fans you can pull at the junkyard). we can discuss wiring it with a relay when you get to that point).

9. additional butyl for insulation(art's pages: http://cleanflametrap.com/ACplumbing.html )


instructions on steps to do the conversion. just thinking, i think i have the volvo green book that shows how, in addition to dave shannon's pdf.

hope this helps you to understand how/ where to start.

please write back if have any additional questions. plenty help from bb friends.

regards,
byron