- 1989–1990 Single-source
C41 Factory-verified
Also described as HVAC, heater only
Also documented for ChevroletOldsmobilePontiacSaturn
Documented applications
- 1998 Factory-verified
This page aggregates every documented appearance of C41 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.