A/C Compressor Relief Valve Replacement

Recover the refrigerant with a recovery/recycling/charging station (see REFRIGERANT RECOVERY ).
Remove the front splash shield (see SPLASH SHIELD REPLACEMENT ).
Remove the relief valve (A) and the O-ring (B). Plug the opening to keep moisture and foreign material from entering the system and the A/C compressor oil from running out.

Fig 1: Relief Valve And O-Ring Of A/C Compressor With Torque Specifications
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Clean the mating surfaces.
Replace the O-ring with a new one at the relief valve, and apply a thin coat of refrigerant oil before installing it.
Remove the plug, and install and tighten the relief valve.
Charge the system (see SYSTEM CHARGING ).