I converted my 65 with a POA to 134. My POA was taken apart, all the guts removed and TIG welded back together, so maybe the POA eliminator that looks stock. I also was told and did only fill the system to 80% of the original amount of R-12 required. I also added a sensor and cycling switch that you see around on ebay and in the conversion kits. My system is ice cold, even in 100 degree heat. The one with the valve stuck open you may just need to adjust the amount of refrigerant.
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"I know just enough to keep me here, but not enough to get me out"
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