Replacing O-Ring Seals

Install new GM-approved service replacement air conditioning O-ring seals whenever a joint or fitting is installed1 except when the O-ring seals are provided on new replacement components. Unless service replacement O-ring seals bearing the specified part numbers are used, excessive leakage of Refrigerant-134a may occur. Refer to the part number for identification.

Air conditioning O-ring seals should be coated with 525 viscosity refrigerant oil just before installation and should be slipped onto the flange tube to ensure proper locating and sealing. To prevent the possibility of swelling and a reduction in sealing effectiveness, O-ring seals should not be soaked in refrigerant oil. Before installation, O-ring seals and fittings should be examined to ensure they have not been nicked or deformed. Replace nicked or deformed parts to prevent refrigerant leakage.