Hyundai Sonata 2011–2014 — technical service bulletin
Bulletin 5NP-H2D6P-12 · NHTSA communication 10119074 · issued Nov 1, 2016
Technical service bulletin
communication type
Equipment Adaptive/mobility
component
2011–2014
model years
4
vehicle entries
Official summary
Some Sonata (YF) vehicles may develop a condition with the separator plate in the middle of the heater box (Heater & Evaporator Assembly) becoming warped and may cause interference against one or more of the internal flaps that control air flow to the vents.
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.