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Its a sensor. Not a switch. Jumping any of the wires at the AC pressure sensor is not going to do anything but possible damage something. It surely wont command the compressor to cycle. AC systems are no longer like they used to be where the pressure sensor acts as a switch. If you want to command the compressor to cycle, do it at the relay, or use a GM diagnostic tool . You can get a cheap china version fairly cheap that works just fine for sort of stuff. Hell I think HP tuners can command the compressor on for that matter.
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