DeVille V8-4.6L VIN Y (1998)
A/C Coupler O-ring: Service Precautions
Dual O-Rings
Tool Required:
J 38042 Dual O-Ring Tube Separator
Install new GM-approved service replacement air conditioning O-rings whenever a joint or fitting is disassembled, except when provided on new
components. Even though O-rings may look the same, it is extremely important that only recommended service replacement air conditioning O-rings be
used. otherwise excessive leakage of Refrigerant-134a may occur.
When replacing O-rings on an air conditioning component or joint connection, the fitting design should be carefully identified to ensure installation of
the correct air conditioning service replacement O-ring.
This vehicle uses dual O-ring joints in the system. This design increases the durability of the joint seal by providing a second O-ring seal. The dual
O-ring fitting 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.
When servicing dual O-ring joints, the following procedures should be followed:
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Completely recover refrigerant from the system.
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Use a J 38042 dual O-ring tube separator to separate the joint while loosening the female nut.
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Whenever a fitting joint is opened, replace the O-rings with new ones.
Use a nonmetallic tool when removing O-rings to prevent the chance of damaging the seal surface.
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Avoid excessive stretching and twisting of replacement O-rings.
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Align the end forms for pilot-to-bore insertion, then push together completely.
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Application of a small amount of 525 viscosity A/C oil will ease insertion.
NOTICE: The use of proper wrenches when loosening or making connections is important. A backup wrench should be used on the brazed or welded
fitting to prevent distortion of the A/C lines.
Important
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Dual O-ring fittings are different in size from standard A/C fitting O-rings.
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Dual O-ring fittings require that the steel nut be tightened to a torque of 24 N.m (18 lb. ft.)
Prior to installation, verify that both O-rings and fittings have not been nicked or deformed. Deformed or nicked parts must be replaced. Failure to use
the proper service replacement parts and procedures may result in a leak.
