I do not know if this is any comfort, but I have a 05 EB that is doing the same thing as you all have been talking about upon startup. I bought the vehicle with 5500 miles and it currently has about 13000. I have taken the vehicle in several times for the problem. The first time it was not duplicated. The second time it was attributed to a blown o-ring on a return AC line.. The the last time, I was given a copy of a service bulliten from FORD explaining that the noise is due to AC fluxuation when starting a cold vehicle. They stated that it is normal and doesn't hurt anything. I was told to AC system on vent before shutting off and it would reduce the chance of the noise occuring.
I have actually searched the web and there is alot out there on this. I would have to be convinced that many people are experincing the same problem. Whether it is right or not, alot of consumers are hearing the same thing on thier expeditions.....
