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The usage of Freeze12 is hypothetical for me since it isn't available here - after R12 was forbidden, R134 has been the only alternative. But that's not all bad - swedish shops now are as good at working with R134 as they were with R12 before, parts are always designed for R134, there are no mix-up risks, pricing is ok and so on.
When it comes to cooling matters of my own car, I suspect some differences in the R12 and R134 designs to be the real problem. If I run the AC hard, the return line and U-bend inside the car will freeze despite of how much hot air I blow through the evaporator. It won't get cooler than that, no matter what refrigerant you use...
The air, however, could get cooler. A faulty or just plain old expansion valve maybe is one possible explanation, but what about the distance between the valve and the evaporator? All R12 systems I've seen have minimal distance between these parts where (original) R134 cars have at least one feet of tubing between the orifice tube and the evaporator.
That is, what if the real cooling starts when the R134 is half way through the evaporator because of this difference? No wonder the air never gets colder than 45 deg F.
Just a thought...
/Martin
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