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Is the compressor engaged?
How do you know it is low on refrigerant?
What is the high side and low side pressure readings - Zero on each?
Ok, if the refrigerant level is too low, there is a pressure sensor that sends a signal to the computer and from there to the compressor clutch to cut power to it. This prevents damage to the compressor from running with no refrigerant.
You will need to unplug the compressor and run jumper wires from the battery to the compressor to jump it so it is running. It will then suck in refrigerant on the low/suction side and fill the system.
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