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7. Heating / A/C Vent Controls
After the vacuum has pulled on a vacuum motor or solenoid it needs to be relieved when they change state. That is the noise you may here in your heating controls. That air should be filtered.If the connection to your air box is broken you can push a gasoline inline filter into the vacuum line and use it as an air filter.
The car has a MAP which is manifold absolute pressure, the MK7 has this sensor.