yeah, it's 2002, there are better options than r134 for us r12 systems now... Just don't want to loose an efficient AC, that's all... Yes, I'll convert if there's a major mechanical failure or major leak, but if not, I'd rather stick with r12.likeparty said:If you need major AC service to your 91-92 have the conversion done. The conversion will compensate for the lower cooling efficiency of R134A vs R12. By the time you pay $50 for a pound or two you will be well on the way to paying for your conversion. If you have a simple leak you will still need a full charge...$150+ the cost of the fix. Just pray that either you have NO problems with the 12 system. Otherwise convert...welcome to 2002.