Ford Expedition 1997–1999 — technical service bulletin
Bulletin 99128 · NHTSA communication 606449 · issued Jun 14, 1999
Technical service bulletin
communication type
Equipment
component
1997–1999
model years
11
vehicle entries
Official summary
Some vehicles may exhibit a whistling noise while driving with a/c in the off position at speeds above 64 km/h (40 mph). *tt
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.