'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?