Mazda B-Series Truck 1998–2000 — technical service bulletin
Bulletin 000401 · NHTSA communication 612576 · issued Apr 1, 2000
Technical service bulletin
communication type
Visibility
component
1998–2000
model years
3
vehicle entries
Official summary
Customer may complain that the heater and / or air conditioner switch from panel vent mode to defrost mode at wide oen throttle on vehicles built before nov. 15, 1999. *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.