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Originally Posted by leathermang
If you are going to change to 134a or suggest others do ... then something else needs to be suggested to take up the natural 20% slack in the efficiency of the molecules compared to R-12.
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I switched to R-134a in my "82 300D. It would not cool acceptably unless the ambient temp was below 85 degrees F. So I'm going back to R-12. I'm planning on a new compressor, exp valve, receiver/dryer and seals. How critical is changing the hoses? I used esther oil, not PAG.