Variable Air Duct (VAD) Check Valve (One-Way) Inspection

WARNING: This page is about a different variant/trim than selected.

Remove the VAD check valve (one-way). (See INTAKE AIR SYSTEM REMOVAL/INSTALLATION ).
Blow through A and verify that air flows from B.
Blow through B and verify that air does not flow from A.
- If not as specified, replace the VAD check valve (one-way).
  
  Fig 1: Identifying VAD Check Valve (One-Way)