One problem related to defogger has been reported for the 2004 Ford Expedition. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Ford Expedition based on all problems reported for the 2004 Expedition.
The Ford hvac blend motors are very poorly designed and fail very often. The internet is full of testimonials on failures of this part in a number of Ford vehicles, including mine, a 2004 Ford Expedition. Quoted repairs to replace the blend motor are in the $700 dollar range.