4X4 , 02

2002 Ford Excursion • V10 4WD Automatic •

Want to trouble shoot and repair my 4x4 (o2 Excursion)not engaging. Had Ford replace a valve last year and it's happened again. Can engage front drive by manually turning the hubs but cannot engage with switch. Think it's vacume problem, but know nothing about the system. Can you guide me as to what to look for.

Thank you.
May 8, 2011.

Hole in hoses or the controller for the vacium is blown. The controller is on you left hand side. Can you turn the heet to feet or window? It s the same controller for the air

Dec 12, 2012.