A/C Coupler O-ring: Service and Repair

O-Ring Replacement

Removal Procedure





1. Disassemble the A/C refrigerant components. Refer to the appropriate repair procedure

* For compression style fittings use a back up wrench on the fitting (2) and loosen the fitting nut (1).
* For banjo style fittings remove the bolt retaining the banjo type fitting.

2. Remove the O-ring seal from the A/C refrigerant component.
3. Inspect the O-ring seal for signs of damage to help determine the root cause of the failure.
4. Inspect the A/C refrigerant components for damage or burrs. Repair if necessary.

Important: Cap or tape the open A/C refrigerant components immediately to prevent system contamination.


5. Cap or tape the A/C refrigerant components.
6. Discard the O-ring seal.



Installation Procedure

1. Inspect the new O-ring seal for any sign or cracks, cuts, or damage. Replace if necessary.
2. Remove the cap or tape from the A/C refrigerant components.
3. Using a lint-free clean, dry cloth, carefully clean the sealing surfaces of the A/C refrigerant components.

Important: DO NOT allow any of the mineral base 525 viscosity refrigerant oil on the new O-ring seal to enter the refrigerant system.


4. Lightly coat the new O-ring seal with mineral base 525 viscosity refrigerant oil.

Important: DO NOT reuse O-ring seals.


5. Carefully slide the new O-ring seal onto the A/C refrigerant component.




6. The O-ring seal must be fully seated.




7. Assemble the A/C components.
Refer to the appropriate repair procedure.

* For compression style fittings use a back up wrench on the fitting (2) and tighten the fitting nut (1) to specification.
* For banjo style fittings install the bolt retaining the banjo type fitting and tighten to specification.