The low pressure port is the port on the larger of the two metal pipes. Find the compressor and follow the smaller metal pipe back to the firewall. You will come across the low pressure port. Normally the cap covering the valve will have an L on it. Normally you cannot connect the can to the high pressure port as it will not fit. Just make 100% sure you are connecting to the low port. Clean off the low pressure port cap before removing it. Any debris that gets in the system will ruin the compressor so be very clean.
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