WG is closed at rest, and with vacuum supplied it opens the WG. I remember this from DP install and porting the WG. I remember adjusting the flapper so there was a slight preload on it upon re-assembly...so that means its closed.
BB-cuda,
I'm not 100%, but I do believe the turbine change over vacuum can retracts the rod with vacuum, so that would be aft, toward the rear end of the car.
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