You should start by removing relays from the Fuse Box bracket before changing the underhood Fuse Box for the a/c harness. Begin replacement of the underhood Fuse Box for the a/c harness by unconnecting the air conditioning a/c relay, a/c Fuse, a/c condenser fan relay and c101, c103, g105 next to the radiator, refrigerant pressure switch and a/c condenser fan motor, a/c compressor clutch connector one after another. The harness should be removed from its retainers before being taken out of the vehicle. The harness should first be placed into the vehicle then connected to its retainers for proper installation. You should reconnect the air conditioning a/c relay, a/c Fuse and a/c condenser fan relay, c101, c103, g105 next to the radiator and refrigerant pressure switch, a/c condenser fan motor, and a/c compressor clutch connector. The process ends with relaying installation onto the Fuse Box bracket.