Chevrolet Sierra 1999–2000 — technical service bulletin
Bulletin 021000 · NHTSA communication 617717 · issued Oct 2, 2000
Technical service bulletin
communication type
Engine and Engine Cooling
component
1999–2000
model years
14
vehicle entries
Official summary
Subject regarding customer complaint of whistle and wind rush or flutter type noise. *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.