From what i have read the 134A is actually a heavier gas than the R12 is so there for it takes more to circulate it and in doing so makes the compressor work alot harder, im not shure on the Freeze 12's make up, but i know we have always added the stuff till the gages read the same as they do on a regular R12 set up, and we see the same duct Temps as we do with the Regular 12. I have converted a few cars to 134 as well and have had no problems either, but it is best to replace the Dryer, and remove compressor and give it a few spins to get the old oil out and add new oil and what not to the system. I usually also put a little bit of stop leak and leak detector in when i go back with the new oil so just in case it does leak some where maby it will stop and if it doesnt then i can find it easier LOL.
Mike
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