Chevrolet Silverado 1999 — technical service bulletin
Bulletin 00601001 · NHTSA communication 611288 · issued Feb 1, 2000
Technical service bulletin
communication type
Engine and Engine Cooling
component
1999
model years
2
vehicle entries
Official summary
Some customers may comment on a whirling sound from the lower rear side of the engine, occuring as the engine warms up, between 1500 and 2000 engine rpm on vehicles within various vin breakpoints. *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.