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As for getting the system to take the 134, have you jumped the low pressure switch? I had to do that to get the a/c to take a charge.
If you have weak A/C and are changing over to 134 then I would change out the orifice tube to a 134 orifice tube (although unless the tube is clogged with debris then I don't suspect that it is part of your current charge problem).
Although the systems are somewhat different, I found the air conditioning section of the 700/900 FAQs had some very helpful information when I did the retrofit and recharge. Check it out at:
http://www.brickboard.com/FAQ/700-900/HeatingAirConditioning.htm
Hope this helps.
Mike
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Mike Brown Greenville, NC 1996 965 113K 1994 940 135K 1986 244 137K
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