C 1500 Truck 2WD V8-6.5L DSL Turbo VIN F (1998)
A/C Coupler O-ring: Service Precautions
O-Ring Replacement
REPLACING 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.
Coat air conditioning O-ring seals with 525 viscosity refrigerant oil just before installation. 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,
O-ring seals and fittings should be examined to make sure they have not been nicked or deformed. Replace nicked or deformed parts to prevent
refrigerant leakage.
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.
