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What does the adapter that is connected to the trottle housing connect to

(1999 Ford Expedition)
in El Paso, TX on July 18, 2013
On the engine it is connected to the PVC tube and to the front Intake what is the other tube facing the rear going to
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Popular Answer
of Greg's Orange Auto on July 18, 2013
poss vac port of intake manifold
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on July 18, 2013
Does this at all connect to the cooling system
on July 18, 2013
Look at digram under the hood.
on July 18, 2013
Does not have diagram this is why I needed Help
on July 18, 2013
I guess i have just been lucky enough to work on those that do.
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