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Most of the pros on the Board at www.ackits.com say they're junk. Don't know of any OEM that uses them either. GM's variable displacement compressor (here's a brief overview: http://www.findarticles.com/p/articl...4/ai_n13780360 ) approaches it from a somewhat different angle, but of all the systems I've owned, that's been the only one that never gave me any problems (and it's nice to have something that never cycles).
IT would be neat to see some sort of modern safer version of a lithium bromide ac used on auto's to make use of all the waste heat.
You lost me - doesn't that stuff boil at 2500 degrees? I don't know how you would turn that into cold air unless you use the steam to spin the compressor??? Current designs is to remove the compressor from the accessory drive train - I think the hybrids all ready do - add a super capacitor to run it and maybe you've saved something - though the future promises 16 to 32 volt systems instead.
See my post under the "134 Super" title. It's been about 3 years since I installed a varible orifice tube. I did it at the same time of the Freeze 12 conversion, so I don't know how it relates to the final performance of the system but I couldn't be happier. Many thanks to Sun CR for the guidence in getting the system going, but note he wasn't the one who recommended the Freeze 12.