there are many common problems with Ford trucks 4.6 and 5.4, usually it will be one of two things. A misfire or a vacuum leak
wont start
A Ford 1999 Expedition engine is probably not seized if it will start and idle but will then not stay running. This could be due to a clogged fuel system, faulty injectors, faulty spark plugs or a wiring problem, or even a faulty distributor.
maybe a fuse
keys have to be reprogram to the cluster
1997 fordexpedition wont start and the theft light is flashing
check the microchip in the key if its missing or bad the truck wont start
Which fan are you refering too? cooling fanHeater fan
Check fuses , or bulbs in radio burn out.
Start by checking your fuel filter.
Type your answer here... It could possibly be the ignition switch.
could be the neutral safety switch.
In the case of my 2003 Expedition, it turned out to be a bad starter motor after 55K miles.