I also have 240 1990. I tried the retro fit. It didnt work for me. To many problems. Perhaps I didnt do it right. I dont know.
Im back with R12. Had my system repaired. Put on new compressor(0ld one shot). Added a condensor fan. Im very happy with my system now. Been trouble free(third summer). Its working like new.
R134 was nothing but trouble for me.
Others here might have different experience. But thats my story and Im sticking to it. A system designed for R12 will have its best, trouble free operation with R12. Have the work done by a professional. System will be efficient, and leak free.
Its your car, your choice. I just wanted to add my two cent worth.
Good luck. Whatever you do, I hope you have icicles hanging from the ceiling In july/august.
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