2001 Chevy S-10 How to jump switch

Air Conditioning problem
2001 Chevy S-10 4 cyl Two Wheel Drive Manual

I see where users say they jumped a switch to engage A/C compressor. Where is the "switch" on the four cylinder accumulator, and how to you jump the switch? I wan to make sure compressor works before taking to mechanic. I know where the leaks are. Just want to know if I need new compressor or not.