So the system was empty. Pulled a vacuum for an hour and it then held for another 40min. So no leaks. Started to fill with r134a and the compressor clutch would not engage. Probably got somewhere around 16 to 20oz of refrigerant in it and it still wouldn’t engage. When pressing the ac but on the climate controls the compressor engages for half a second then disengages. Bypassed the low pressure sensor to test and compressor would not take any more refrigerant. Still blowing hot. Any help would be greatly appreciated!