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Check the replies on you post at Chevy Talk. The harness for the A/C compressor goes to the passenger side of truck, completely separate. There is sometimes two greens in the A/C harness one goes to the compressor the other goes to the idle compensator. Verify that the wire is in the main connector on the firewall, I would start there, If the original owner pulled the wire out of the cavity you might be looking in the harness a long time.