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Definitely check out Urban's site. Keep in mind that the 900 is a much newer system though. You (we) with older 240's are dealing with a host of efficiency issues, one of which is the poor efficiency of the older style evaporators and condensors, valves, etc. On our '83 I replaced the York compressor with the later, rotary style and had the sytem converted to R134 professionally, but left everything else stock. I'm never one to turn the car over to "professionals", but after many tries (and a ton of bucks in equipment) I have only once done a conversion that was trouble free and ultimately effective. More to the point, it takes me hours to do it! It cost $200 to have our '83 converted including o-rings, flush, oil and coolant (no, the older oil is not compatible, you'll have to flush it). When our temps cross 105 the system is marginal, but anything below that it's fine, though certainly not as good as when it was R12. For another $150 I could have gone to the newer style condensor and valve, which I would have put in myself. At that point I would have done the o-rings myself too. However, in the end, I find it is always best to take it in for flush, draw down and charge. One more thing, most shops do a high pressure test first, which is a great way to find bad seals, hoses, compressor joints etc.
DS
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