2004 ford expeditionFebruary 7, 2014even after it’s warmed up it makes high pitched whistling noise off and on for a while. what do you like it might be. Keywords:ExpeditionNoisewhistling noise 1 thought on “2004 ford expedition” Freeautomechanic February 7, 2014 at 12:43 pm could be a belt, alternator or air conditioner. Remove the belt and run the engine and if the noise goes away, you have narrowed it to just the belt and what it attaches to. put the belt back on and when the noise starts, spray a bit of WD-40 on it and if the noise quits, replace the belt. Comments are closed.