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<blockquote data-quote="SoonerP226" data-source="post: 4248288" data-attributes="member: 26737">I used one of those R134 conversions on my &#039;91. The R12 had pretty much all leaked out, so I bought a cheap pneumatic vacuum pump from Harbor Freight, replaced the o-rings I knew about, and drew a vacuum on the system for 30 minutes, then installed the fitting adapters that came in the kit and recharged the system with the refrigerant/oil mix (also from the kit).I wasn&#039;t expecting much, but it didn&#039;t have working AC when I got it, so I figured anything would be an improvement. Much to my surprise, it actually worked really well, and I had cold AC after it was done. It seems like I had to chase a minor leak or two, but nothing major, and the refrigerant mix had the UV dye in it to help find the leaks, as well as some kind of leak sealer.FWIW, I&#039;m pretty sure you&#039;re correct about &#039;94 being the changeover to R134.</blockquote>

[QUOTE="SoonerP226, post: 4248288, member: 26737"] I used one of those R134 conversions on my '91. The R12 had pretty much all leaked out, so I bought a cheap pneumatic vacuum pump from Harbor Freight, replaced the o-rings I knew about, and drew a vacuum on the system for 30 minutes, then installed the fitting adapters that came in the kit and recharged the system with the refrigerant/oil mix (also from the kit). I wasn't expecting much, but it didn't have working AC when I got it, so I figured anything would be an improvement. Much to my surprise, it actually worked really well, and I had cold AC after it was done. It seems like I had to chase a minor leak or two, but nothing major, and the refrigerant mix had the UV dye in it to help find the leaks, as well as some kind of leak sealer. FWIW, I'm pretty sure you're correct about '94 being the changeover to R134. [/QUOTE]

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