My dad is a certified for A-C mechanic's and converts to r134A all the time, we have 1400 pounds of r12 on hand, but people dont want to spend the dough on the freon, so my dad converts over to 134a you DO NOT have to remove the old r12 oil, it is Better to remove it yes, but it is not nessary, he have done 100's of conversions by adding just ester 100 oil, which works with r12 oil, do not ever use Pag oil which does NOT work with r12 oil. My friends 88 TC has R134a in it, for 5 years now, never ONE problem, still blows cold as ICE.
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~ITaliano~
88 Whtie turbocoupe on Raven,All opitons minus leather, and keyless, 5 speed, K&n frount mounted, boosted to 18psi, new paint, clutch,White faced gagues, Custom painted interior trim pieces (change from blue to charcol to blackish purple kinda color)Premier dep730R headunit, 2 12" jbl Comp' intercooled subs in box, 3 amps, Lowered 1 inch, AM lunar boost, air fuel, tach, mustang pod, Countless other mods.. look ok Tim Jones
hehe