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Removing and installing combination valve for secondary air system (left-side) > < Secondary air system - exploded view

A4 Mk3

Checking combination valves for secondary air system for correct operation and leakage
Checking combination valves for secondary air system for correct operation and leakage
Special tools and workshop equipment required
   
t  Hand vacuum pump -VAS 6213-
  W00-10259
Procedure
l  Vacuum hoses and hose connections do not leak.
l  Vacuum hoses are not clogged.
–  Lift off engine cover panels -1- and -2-.
  A10-11070
–  Detach vacuum hose -1- or -2- from combination valve to be checked.
–  Connect hand vacuum pump -VAS 6213- to vacuum hose of combination valve to be checked.
  A26-10735
–  Press release tabs and detach secondary air hose -arrow- to front from bracket.
–  Blow lightly into secondary air hose with your mouth (do not use compressed air).
l  The combination valves for secondary air should be closed; it should not be possible to blow through the hose.
–  Operate hand vacuum pump.
l  The combination valve should open; it should now be possible to blow through the hose.
–  Renew combination valve for secondary air system if it does not open: on left-side → Chapter, on right-side → Chapter.
Assembling
Installation is carried out in the reverse order; note the following:
  Note
Fit new O-ring.
  A26-10731

Removing and installing combination valve for secondary air system (left-side) > < Secondary air system - exploded view