Refrigerant Circuit Seals

• Make exclusive use of seals which are resistant to refrigerant R1234yf and the related refrigerant oils. Color coding of the seals is no longer offered. Black and colored seals are used, for this reason only use seals which can be clearly assigned. Refer to the appropriate Electronic Parts Information.

• Seals which were developed for refrigerant R134a, are not always suitable for refrigerant R1234yf for this reason only use seals which can be clearly assigned. Refer to the appropriate Electronic Parts Information.
• The seals may be used only one time.
• Replace the seals after removing.
• Coat the seals with refrigerant oil before installing.
• Make sure the seals are positioned correctly on the pipe or in the groove.
• Ensure cleanliness when working. Even the smallest contaminant, a hair for example, can cause a leak.
• Only install seals that are resistant to refrigerant R1234yf and the corresponding refrigerant oil. These seals can be color-coded to eliminate the risk of interchanging. Refer to the appropriate Electronic Parts Information.

The dimensions -a and b- are dependent on the component location of the seal. Refer to the appropriate Electronic Parts Information.

Fig 1: Checking O-Ring Seal Diameters

Courtesy of AUDI

Refer to SEALS for additional information and notes.