There is a pressure sensor that shuts down the compressor when it's empty follow the line from the compressor back to a switch or pigtail and if theres a switch, flip it then turn on ac, if pigtail unplug and jump the terminals and turn on ac, if the compressor kicks on then the refrigerant and possibly the oil leaked out of the system so you don't want to run the ac for more than the test if it's empty
IS THE SYSTEM CHARGED UP, NO CHARGE NO AC COMPRESSOR OPERATION.
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