Refrigerant Connection: Removal

WARNING: This page is about a different car, the 2013 Infiniti FX50. However, it is still accessible from the selected car via links, so may be relevant.

Clean piping connection point, and set a disconnector.
Slide disconnector in axial direction of piping, and stretch garter spring with tapered point of disconnector.

Fig 1: Removing Garter Spring From Cage
Courtesy of NISSAN NORTH AMERICA, INC.
Slide disconnector farther so that inside diameter of garter spring becomes larger than outside diameter of female-side piping flare. Then male-side piping can be disconnected.