O-Rings

Install new GM-approved service replacement air conditioning O-ring seals whenever a joint or fitting is installed, 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.

Coat air conditioning O-ring seals with 525 viscosity refrigerant oil just before installation and slip them onto the flange tube to ensure proper locating and sealing. To prevent the possibility of swelling and a reduction in sealing effectiveness, do not soak O-ring seals in refrigerant oil. Before installation, examine O-ring seals and fittings to make sure they have not been nicked or deformed. Replace nicked or deformed pans to prevent refrigerant leakage.