GMC Pickup 1999–2001 — technical service bulletin
Bulletin 040601 · NHTSA communication 623754 · issued Jun 4, 2001
Technical service bulletin
communication type
Visibility
component
1999–2001
model years
3
vehicle entries
Official summary
Vehicles may experience unwanted air entry through the ventilation system. *slc
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.