Kia Optima 2016–2019 — technical service bulletin
Bulletin PS638 · NHTSA communication 10169695 · issued Dec 13, 2019
Technical service bulletin
communication type
Equipment
component
2016–2019
model years
4
vehicle entries
Official summary
PITSTOP 638: HVAC TEMPERATURE BLEND DOOR INOPERATIVE, TICKING AND/OR MAKING A POPPING NOISE - This Pitstop provides information regarding an inoperative, or clicking and popping noise concern from the heater box blend door.
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.