North American Turbocoupe Organization



R12 to R134a conversion
shiftless Offline
Member
#11
dm22, you MUST remove all the old oil, because the old oil is INCOMPATIBLE with R-134a.. it may or may not cause you problems, since you did add some R-134a compatible oil...
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[email protected] Offline
Banned
#12
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 Smile hehe
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flylear45 Offline
Member
#13
My experience is the same. The new synthetic oil is OK to mix, DO NOT USE PAG oil. I always change the drier. The reason is, the dessicant material used in (some) R-12 driers can come apart and get into the system, plugging it and making a general mess. They are usually less than 50 bux if you call around. Autozone seems to be good for A/C stuff hereabouts.

My TC, Porsche, and Chevy truck are all blowin' cold after doing it this way. I used the Castrol kits bought from Wal=Mart for $25.00 with Freon.

BTW, I go get the old R-12 sucked out first, and I bought a 12 dollar vacuum pump to draw down the system before putting in the new R-134. Just remember, if it's leaking, it ain't gonna work long!

While on the subject, you can get better performance out of GM and some other Frigidaire units with a different expansion valve sized for the R-134. My Porsche is borderline due to size and location of the condenser, but the TC seems to have a good enough system to work well as is with the conversion.

Jim
88 TC 5.0 turbo project

79 TR7 convert 2.3 turbo project
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Blennidae Offline
Junior Member
#14
Another A/C related question.

The A/C in my 87 isn't working, and hasn't been for a few years. I'm pretty sure the refrigerant has leaked out. I haven't had it fixed, because the cost quote I got to have it fixed was so high (fill with 2 lb r-12 @ some big $ amount with a dye so they could see the leak, then drain the r-12 fix the leak and put in new r-12). I can roll the windows down...

But if the conversion requires seal replacements anyway, would it be cost efficient to have it professionally converted over to r-134?
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