For 1998 Ford Truck Windstar 3.8L SFI 6cyl check this...
Fig. 1: Vacuum distribution schematic-3.8L engine
Fig. 2: Vacuum distribution schematic-3.8L engine
Hope this helps (reember to rate this answer).
I have been attempting to find the vacuum modulator, which is a part of the transmission ( I now know this after a day of research ). The guy at the Ford Dealer was telling me it was a vacuum actuator.
Well, to make a long story short, the vacuum actuator is a combustion control, whereas the vacuum modulator is a control mechanism internal to the automatic transmission.
The purpose of the vacuum modulator is to facilitate proper up-shift and down-shift between gears. Thank you for the visual aids.
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SOURCE: vacuum line diagram for 1998 windstar
look on the engine compartment either on the finder or the hood
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