O-Ring Seals

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Make exclusive use of seals which are resistant to refrigerant R134a and the related refrigerant oils. Color coding of O-rings is no longer employed. Colored and black O-rings are used.
Be sure to use seals with the correct inner diameter. Refer to [For engine(s) CTUA, CEUC, CRDB, CGXB, CPNB] System Overview - Refrigerant Circuit (vehicle-specific repair information).

The O-rings may be used only one time.
Coat the seals lightly with refrigerant oil (PAG oil) before installing.