Hi Gilly, I guess the easist way to find out where it goes is ot run a thin piece of wire (24 guage) thrue the vaccuum line, hook the Positive polarity of a 9 volt battery to the wire and run another piece of wire from the Negative side of the battery to the a grounding point on the car. I have a circuit finder the will trace exactly where the vaccuum line goes. It can find high voltage wires up to 15 feet below ground so this should be a snap. Wish me luck!

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1991 190E Mercedes Benz---1973 DeTomaso Pantera