Question about 1999 Volkswagen Passat

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Vaccuum under the air filter box runs even when the key isnt in

There is a 3/4 in hose going form the air filter box down to something underneath of it. It is some sorrt of vaccuum, that vaccuum runs even when the key isnt in the ignition, draining the battery. Jumped it to get it started and then it would surge at 1500 rpms and had hardly any power. Took it to a vw mechanic who charged a lot of money and said they fixed it. A week later It is still doing it and now when i try to jump start it, it will turn over, but it wont start.

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It sounds like your air pump is malfunctioning. It is used to pump emissions out the back of the car. it is controlled by a vacuum. These will drain your battery if the vacuum does not send a signal to shut it off.

Posted on Jan 01, 2009

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