Pontiac Grand Prix 1998–2000 — technical service bulletin
Bulletin 1538 · NHTSA communication 10005377 · issued Jan 1, 2004
Technical service bulletin
communication type
Equipment
component
1998–2000
model years
3
vehicle entries
Official summary
Intermittently, the automatic hvac goes to hi blower speed even though the system is in off position. Sit bulletin 1409013. *tt
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.