Combination valve for secondary air injection, checking function and for proper seal

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

Work sequence

Fig 1: Combination Valve Pressure Hose & Bolts

GW00029076

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Disconnect pressure hose - 1 - at combination valve for secondary air injection.

NOTE:

Ignore - arrows - in the illustration.

Connect an appropriate assisting hose to combination valve.
Blow into assisting hose using light pressure (do not use compressed air).

Combination valve must be closed, it must not be possible to blow through.

Blow into assisting hose using higher pressure (do not use compressed air).

Combination valve must open, it must be possible to blow through.

If the switching point is not recognized:

Replace combination valve: Left → Left combination valve for Secondary Air Injection (AIR), removing and installing , Right → Right combination valve for secondary air injection, removing and installing .