Ford E-150 1998 — technical service bulletin
Bulletin BC5175961001 · NHTSA communication 50454 · issued Oct 1, 1996
Technical service bulletin
communication type
Equipment
component
1998
model years
1
vehicle entries
Official summary
Concerns of a/c going to defrost mode when climbing grades or accelerating are likely caused by vacuum leaks. *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.