GM Service Manual Online
For 1990-2009 cars only

    Object Number: 257968  Size: SH
  1. Prevent dirt and foreign material from the sealing surfaces of the washers, the hose block, and the A/C compressor ports.
  2. Clean all of the sealing surfaces with a lint-free rag.

  3. Ensure that the sealing washers are seated.
  4. Important: DO NOT reuse sealing washers.

  5. The washers must bottom against the surface of the block fitting.