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R410 systems run at double r134 pressures and generally use a variable orifice to deal with variable speed ecm controlled compressor. Some systems have a bigger accumulation trap.
Not sure if 410 is more energy efficient.
Other thing which is famous on F250: block engine coolant from interior heater when running A/C
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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