One problem related to defogger has been reported for the 1997 Ford Expedition.
The most recently reported issues are listed below.
1 Defogger problem
Failure Date: 01/01/2001
Mechanic said Ford changed design because of faulting placement of the vent. Ford said they would have replaced if mileage was under 50k and I was the original owner.
Other Visibility related problems of the 1997 Ford Expedition