Question about 1997 Ford Expedition
the 4x4 don't use vacuum. the front is auto lock when the transfer is engauged with the button. if the light don't which when pressed into 4hi or 4low. the motor on the transfer case maybe hung up. they have to be used at least 4 times a year not to go bad. the motor is on the back side of the transfer case. best of luck.
Posted on Aug 07, 2009
That is something you would have a very hard time finding on the internet, but the Chilton shop manual has a vacuum diagram for every engine in your model. You can find that manual or another brand at your local parts shop.
Posted on Jan 24, 2010
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