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Service bulletin KC-991

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10185295
Published by NHTSA2021-01-07
Manufacturer's numberKC-991
Manufacturer's date2020-12-08
NHTSA componentVISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM; EQUIPMENT:APPLIANCE:AIR CONDITIONER; EQUIPMENT ADAPTIVE/MOBILITY

NHTSA's summary

Volvo Chassis - Heating/Air Conditioning System (HVAC) Whistle From Vents At Highway Speeds - Build Date 1 January 2018 And Newer

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Equipment and accessories, Glass, wipers and mirrors, Heating and air conditioning

Vehicles listed
VOLVO VOLVO
VOLVO VOLVO TRUCK

Listing a model year does not mean every vehicle of it is concerned: the document says which.