O-Rings

Important
^ Install new GM approved service replacement air conditioning O-rings whenever a joint or fitting is disassembled, except when provided on new components. Even though an O-ring may look the same, it is extremely important that only recommended service replacement air conditioning O-rings be used or excessive leakage of refrigerant may occur.

ALWAYS LUBRICATE THE O-RING WITH 525 VISCOSITY REFRIGERANT MINERAL OIL AND SLIP THE O-RING ONTO THE FLANGE TUBE TO ENSURE PROPER LOCATING AND SEALING. TO PREVENT THE POSSIBILITY OF SWELLING AND A REDUCTION IN SEALING EFFECTIVENESS, DO NOT LUBRICATE THE O-RINGS WITH PAG REFRIGERANT OIL.

Also, prior to installation, verify that both O-rings and fittings have not been nicked or deformed. Deformed or nicked parts must be replaced. Failure to use the proper service replacement parts and procedures may result in excessive refrigerant-leakage.