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You probably jumped the high pressure switch if the aux fan comes on at low speed. Jump the 2 switches if you do not know which one, it does not hurt. You need to make sure all electrical works as expected first, compressor ( clutch ) comes on and the aux fan runs at slow speed. You may have CCU or compressor issues.
I find the low pressure switch will be 'activated' simply by charging at the low pressure port, with our without the compressor running. This has been my experience. However, you should sort out the electrical first before you start charging.
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