Work sequence

WARNING: This page is about a different car, the 2006 Audi A4, 2005 Audi A4, 2004 Audi A4, and 2003 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Connecting Hand Vacuum Pump V.A.G 1390 To Vacuum Connection Of Charge Pressure Bypass Valve

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Connect vacuum pump VAG1390 to air recirculation valve.
Operate vacuum hand pump.

Air recirculation valve should open - arrow -.

Operate air vent valve on vacuum pump after approx. 30 seconds.

Air recirculation valve should close - arrow -.

If the mechanical air recirculation valve does not open and close as specified, or if the valve plate does not seal properly when the valve is closed:

Replace mechanical air recirculation valve and secure hose connections with hose clamps.