Cadillac Deville 2003 — technical service bulletin
Bulletin 030137001 · NHTSA communication 10001277 · issued Mar 1, 2003
Technical service bulletin
communication type
Equipment
component
2003
model years
2
vehicle entries
Official summary
Humming noise with heater on high and fan speed at med/high. *tt
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.