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I'll try... Hot compressed gas leaves the compressor via the small hose (aka high side hose) and enters the top of the condensor where it will cool off a little and "condense" from a hot gas to a hot liquid refrigerant. It leaves the bottom of the condensor, and heads straight towards the evaporator as a hot, high pressure liquid. To get it to boil, and absorb the heat from the inside of the car, we need to turn that hot high pressure liquid into a low pressure boiling liquid. That refrigerant pressure drop happens right before it enters the evaporator via an expansion valve or an orifice tube. This is the pressure split. Then it goes from a low pressure liquid to a low pressure gas and heads back to the compressor to start the whole cycle over again. Hope that didn't confuse you too much. Chris Bede
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