| | | quote | Originally posted by trivet:
I converted to R134a and last year and not a problem since. R12 cools better, but the Fiero has such a small cabin, the R134a is fine.
Easy way to check for leaks:
1. Get a Air vacuum pump from Harbor Freight.
2. Create a vacuum in the A/C system
3. Wait a few days, check to see if the system holds a vacuum. If so, no leaks.
4. Buy a conversion kit and follow the directions.
I bought my Fiero 3 years ago and it had no A/C. Performed the above steps last spring, have enjoyed driving my Fiero in 90+ degree weather again! 
Be very careful hooking the adapter to the condenser, the threads are aluminum and strip easily...don't ask how I know this. 
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Basically good info BUT one of the main reasons that R-134a retrofits do not cool as well as the R-12 did is that most people do not remove all of the old 525 mineral oil before putting in the Ester Oil and recharging w R-134a. If you purge the lines, purge the condenser and dump out the old compresssor oil that was in the system, you will get a maximum charge in there for optimum cooling. I would also change the accumulator, orifice tube and O rings on the lines.
Below is a guide to R-134a recharging and the expected gauge readings for a full charge.
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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Powerlog manifold, Northstar TB, LS1 MAF, 3" Flotech Afterburner Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS" 87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE " [This message has been edited by Dennis LaGrua (edited 07-07-2012).]
