Water Separator

Check visually for insect nests in the water separator air inlet.
Check visually for cracks or flaws in the appearance.
Check visually for cracks or flaws in the hose.
Check that A and C are not clogged by blowing air into B with A , and then C plugged.
In case of NG in items 2 - 4, replace the parts.
NOTE:
- Do not disassemble water separator.
  
  Fig 1: Inspecting Water Separator
  Courtesy of NISSAN MOTOR CO., U.S.A.