Install new GM-approved service replacement air conditioning O-rings whenever you install a joint. Do not provide new seals when the seals accompany new parts. The refrigerant R-134a may leak if the incorrect seals are used. Refer to the part number of the O-ring for identification. Do NOT rely on the former color-coating method of O-ring identification. Some formerly color-coated service replacement O-rings may now be black.
Coat the air conditioning O-ring seals with the 525 viscosity refrigerant oil before installation. Slip the seals onto the flange in order to ensure proper locating and sealing. Do NOT soak the seals in refrigerant oil. Soaking the seals in refrigerant oil may cause the following conditions:
| • | Swelling of the O-ring |
| • | Reduction in the sealing effectiveness |
Inspect the O-rings for nicks or deformation before installation. Replace damaged O-rings in order to prevent leakage.
