When my compressor took a dump I did the conversion on my 90 4runner.... Total cost..85.00 and that included the compressor. The front seal was leaking on mine. got a low milage unit off a 98 4runner swapped the line cap and replaced the seal. put about 6oz of pag oil in the compressor bolted her up, pulled vacuum and charged it with 134. it blows far colder then the r12 that was in there.. the compressor is the same for both the r12 and the 134 systems they only changed the condenser.. but it blows 33 degrees at the vent without changing that in my black on grey baby. now my 4runner a/c blows colder then my 01 galant a/c.