If you are going to adjust it you need to measure the temp right after the valve, then at the end of the evaporator. Measure the pressure, then look at your pressure temp chart, differance is superheat. Need some superheat, about 15-20 or so to be sure to evaporate all refridgerant. Vstech may want to chime in on this, but this is my basic understanding. Had to set one on a thermo king unit once.

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1977 240D turbo