Chevrolet Trailblazer 2003–2006 — technical service bulletin
Bulletin 3857 · NHTSA communication 10019211 · issued Feb 21, 2006
Technical service bulletin
communication type
Engine and Engine Cooling
component
2003–2006
model years
9
vehicle entries
Official summary
Supplement to bulletin 05-01-37-002a, poor rear heat performance . *ak
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.