Buick Skylark 1996–1997 — technical service bulletin
Bulletin 631109 · NHTSA communication 51246 · issued Jan 1, 1997
Technical service bulletin
communication type
Visibility
component
1996–1997
model years
6
vehicle entries
Official summary
Air coming from i/p vent while in heater modes or a delay occurs when changing to a new mode setting (diagnose/modify/replace). *tw
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.