Jetta GLX V6-2.8L (AFP) (2002)
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Check the valve flow:
A) Orifices 1 - 1:
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Flow in both directions, port 2 closed
B) Orifices 2 - 1:
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Flow in both directions, port 3 closed
C) Orifices 1 - 2:
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Flow in one direction, port 3 closed
The valve will close when there is vacuum at opening 1.