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A/C questions 700 1992

posted by  acreprmn on  Tue Apr 5 10:36 CST 2005
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last visit: Tue Jun 17 08:23 CST 2008
[RELATED]

I just converted my 92' 740 to 134a and came into some new information. I just read that on r12 to 134a conversions DO NOT flush the system as the hoses will leak. Replace the compressor , orfice tube, and accumulator,and any o rings that are in connections you broke open evacuate and charge. My tables show 38 oz. for a 240 and 40 oz. for a 740. The deal on flushing seems to be that the r12 oil has penetrated and sealed the hoses and since the new oil is compatable the hoses stay sealed. If flushed the hoses become more porous and prone to leakage. I followed that process and so far no leaks.






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