Ford Excursion 1999–2000 — technical service bulletin
Bulletin 13859 · NHTSA communication 612458 · issued Feb 1, 2000
Technical service bulletin
communication type
Power Train
component
1999–2000
model years
3
vehicle entries
Official summary
Some vehicles equipped with electronic shift on the fly transfer case may exhibit front hubs that will not unlock / lock with mode switch; noise from the front axle while in 2 wheel drive mode, air conditioning switching to defrost when shifting into or out of 4 wheel drive mode. *tt
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.