K 1500 Suburban 4WD V8-5.7L VIN R (1997)
A/C Coupler O-ring: Service Precautions
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:
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An aluminum-alloy, externally threaded fitting which is brazed or welded to an aluminum tube.
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A free-spinning, plated steel internally threaded nut.
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A precision machined, male-piloted aluminum tube end which accommodates two O-rings.