Quote:
Originally Posted by mbzjag8090
This is from experience with a 300 SD W126. The R134 has no noticeable difference. It works well in 90+ plus temperatures. Before I replaced the evaporator I was running R134 and it worked great. To the OP, if you search the forums you can find a number of people who live in the deep South and are very happy with R134. I do not doubt that R12 is slightly better and will admit that it seems R134 can be hit or miss, but the idea that R134 cannot be successful in a 126 is factually incorrect.
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... very cold temps are indeed attainable with a 126, however, everything needs to be in good tune, and you need to be moving at speed for it to be cool... city traffic, 95°F temps, and untreated windows, and forget it! you'll be sweating for sure.
with R12, the same well tuned a/c system will produce 38F vents at idle up to around 98F