'90 LS400 240,000miles
With no A/C blowing, I recently converted the refrigerant from R12 to R134. The system still does not blow cold. Dealership says compressor is gone. Worked fine in the fall. While investigating rebuilt OEM compessors, I read some posts re: the upgraded R134 system working at different pressure than the R12 system and the original A/C pressure valve (which controls the compressor) may not work when the system is converted to R134.
Any merit to this? Should the original pressure switch work properly in a converted A/C system?
Thx Chip L