Mechanics

IS THERE A VACUUM SWITCH FOR THE FRONT DIFFERENTIAL TO ENGAGE FOUR WHEEL DRIVE?

1998 Ford Expedition • 120,000 miles

My Expedition will not engage the front differential, but does engage the rear differential in four wheel low. Is there a vacuum leak or a vacuum switch that might be diffective? If so where is the switch or acuator located?
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Milton Miller
November 6, 2011.



See below:


Rasmataz
Nov 6, 2011.