Allroad Quattro V8-4.2L (BAS) (2004)
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On vehicles with auxiliary heater, remove bolts (arrows) for exhaust pipe of auxiliary/additional heater at noise insulation.
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Remove pressure hose (arrow) at secondary air pump.
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Blow gently into pipe (do not use compressed air).
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Both combination valves must be closed and it must not be possible to blow through them
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Operate vacuum hand pump.
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Corresponding combination valve must open and it must be possible to blow through it
If corresponding combination valve does not open:
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Replace combination valve.