GM Service Manual Online
For 1990-2009 cars only
  1. Place an assistant inside the vehicle in order to detect the actual leak points.

  2. Object Number: 95572  Size: SH
  3. Use an unrestricted water flow. Do NOT use a nozzle.

  4. Object Number: 160920  Size: SH
  5. Begin at the base of the suspected leak area and slowly move upward.