A6 Quattro Sedan V6-3.0L (AVK) (2002)
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Remove bolts for holding plate for solenoid valves (arrows).
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Lift up holding plate and disconnect vacuum hose from Y-piece of combination valve to be checked.
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Connect VAG1390 hand vacuum pump to vacuum hose of combination valve to be checked.
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For vehicles with auxiliary heater, remove bolts (arrows) for exhaust pipe of parking heater/auxiliary heater at noise insulation.
