Test sequence

• Open quick-release fasteners -1- and -2- and lift off engine cover panel (arrows).
• Remove engine cover panel bracket.
Fig 1: Removing Engine Cover Panel Bracket
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• Remove mechanical air recirculation valves -1- and -3-.
Fig 2: Removing Mechanical Air Recirculation Valves -1- And -3
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• Connect vacuum pump V.A.G 1390 to air recirculation valve.
  Fig 3: Connecting Vacuum Pump V.A.G 1390 To Air Recirculation Valve

  Courtesy of AUDI OF AMERICA, INC.
• Operate hand vacuum pump.
  • Air recirculation valve should open (arrow).
• Operate air vent valve on hand vacuum pump after about 30 seconds.
  • Air recirculation valve should close (arrow).

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

• Replace air recirculation valve. Secure hose connections on valve with hose clamps (same as original parts). See parts catalog.