Well, this URL will help with what I think is the hardest part, the dash removal. http://www.scribd.com/doc/377317/Expedition
ask a repairman
First, check the fuse box and replace the fuse for the indicator lights. If the lights still do not work then replace the dash bulb itself.
The dash has to be removed. Once the dash is out, the top of the heater case comes off to gain access to the core.
If you have tiny hands you can reach up and twist the bulb holders out to replace the tiny bulbs
where are the dash bolts located to replace burnt dash lights
Underneath the dash.
You have to take out the cluster and there is a single bulb in there that you replace not real hard
the HEATER CORE can be removed by removing the dash. how do i ghange the dash
Vehicle is in need of service...
remove the gage cluster the bulb is on the back of the cluster
it depends on the vehicle, on my motorcycle i have to remove the side and front plasics then remove the dash unit, then open the dash unit and replace the bulb, then put everything back.
I had the same problem with my expedition and they said it was the vent door on the blower which is located in back of the glover compartment. In order for them to replace that part they have to take the dash board apart.