I know, I have searched the forum for insight and there is quite a bit but here goes... I have a 1992 with all the original components (drier, expansion valve and compressor) with R12. Does it make sense to replace all items if I am converting to R134? I have not had AC for ther past 2 years (just didn't deal with it) and now I am ready to do the conversion. Any insight is much appreciated!