Land Rover Discovery 2017–2020 — technical service bulletin
Bulletin JLRTB02015NAS1 · NHTSA communication 10171123 · issued Jan 14, 2020
Technical service bulletin
communication type
Equipment
component
2017–2020
model years
4
vehicle entries
Official summary
When activating the max defrost setting from an OFF condition on the climate control, an abnormal "hooting" type sound may be heard from the instrument panel.
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.