Replacing Dual O-Ring Seals

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

This vehicle uses GM's dual O-ring joint design in the system. This design increases the durability of the joint seal by providing a second O-ring seal. The dual O-ring design consists of:

- An aluminum-alloy, externally threaded fitting which is brazed or welded to an aluminum tube.

- A free-spinning, plated steel internally threaded nut.

- A precision machined, male-piloted aluminum tube end which accommodates two O-rings.