# Service bulletin SIB640821

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.

- Type: Service bulletin
- NHTSA id: 10218379
- Published by NHTSA: 2022\-08\-22
- Manufacturer's number: SIB640821
- Manufacturer's date: 2022\-06\-01
- NHTSA component: VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM

## NHTSA's summary

The air conditioning cycles from cold to warm air while driving or while at a stand still. The vent outlet temperatures vary by 25 degrees Fahrenheit or more \(38 F to 60 F \+\) without changing any climate control settings. In some cases the air conditioning may have stopped blowing cold air altogether.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2022/MC-10218379-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2022/MC-10218379-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Glass, wipers and mirrors, Heating and air conditioning

## Vehicles listed

- BMW 530
- BMW 540
- 2012 to 2019 BMW 640I
- 2020 BMW 640I
- BMW 740
- BMW 750
- 2019 BMW 840I
- 2020 to 2022 BMW 840I
- 2021 to 2023 BMW ALPINA XB7
- BMW M5
- 2017 BMW M550I
- 2018 to 2021 BMW M550I
- 2017 to 2021 BMW M760I
- 2019 BMW M8
- 2020 to 2022 BMW M8
- 2020 BMW M8 GRAN COUPE
- 2018 to 2019 BMW M850I
- 2020 to 2021 BMW M850I
- 2019 BMW M850XI
- BMW X5
- 2000 to 2007 BMW X6
- 2008 to 2022 BMW X6
- 2008 to 2012 BMW X6 M
- 2015 to 2020 BMW X6 M
- 2019 to 2023 BMW X7

## Recalls for the same vehicles and component

- [22V820000](/recalls/nhtsa/22V820000.md), 2022-11-02: VISIBILITY:WINDSHIELD
- [22V267000](/recalls/nhtsa/22V267000.md), 2022-04-20: VISIBILITY:SUN/MOON ROOF ASSEMBLY
- [2021078](/recalls/tc/2021078.md), 2021-02-18: Visual System
- [2019480](/recalls/tc/2019480.md), 2019-10-01: Visual System
- [10V025000](/recalls/nhtsa/10V025000.md), 2010-01-28: VISIBILITY:WINDSHIELD
- [2010017](/recalls/tc/2010017.md), 2010-01-26: Visual System

## Other bulletins for the same vehicles and component

- [B065825](/bulletins/11025851.md), 2025-12-01, Other: VISIBILITY/WIPER. Rear Glass Return
- [B630418](/bulletins/11020927.md), 2025-07-28, Service bulletin: VISIBILITY/WIPER. One or more of the LED daytime running lights are dim or discolored.
- [B510819](/bulletins/10249437.md), 2024-02-01, Service bulletin: VISIBILITY:POWER WINDOW DEVICES AND CONTROLS; ELECTRICAL SYSTEM. The basic conditions for initializing the power windows are not met.
- [B540421](/bulletins/10244239.md), 2023-11-01, Service bulletin: VISIBILITY:SUN/MOON ROOF ASSEMBLY; STRUCTURE. This situation can result in two customer complaints: 1. Wind noise 2. Excess water entry
- [B540521](/bulletins/10242698.md), 2023-09-25, Service bulletin: STRUCTURE:BODY:ROOF AND PILLARS; VISIBILITY:SUN/MOON ROOF ASSEMBLY. ?The sunroof will not operate in either direction.
- [B540123](/bulletins/10242696.md), 2023-09-25, Service bulletin: STRUCTURE; VISIBILITY:SUN/MOON ROOF ASSEMBLY. ?Water leaking into the vehicle from the headliner/microphone area.
- [B650222](/bulletins/10242530.md), 2023-09-18, Service bulletin: VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM:COMPRESSOR:MODULE \(ACCM\). A check control message \(CCM\) for the restraint system \(Air bag\) appears.
- [B640821](/bulletins/10239614.md), 2023-07-24, Service bulletin: VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM. The air conditioning cycles from cold to warm air while driving or while at a stand still. The vent outlet temperatures vary by 25 degrees Fahrenheit or more \(38 F to 60 F \+\) without changing any climate control settings.
- [B511722](/bulletins/10238080.md), 2023-06-26, Service bulletin: VISIBILITY:REARVIEW MIRRORS/DEVICES; ELECTRICAL SYSTEM. Due to the semiconductor supply, the Local Interconnect Network module in either of the exterior mirrors was switched to another controller. That one provides an imprecise voltage measurement, which the main controller interprets as a fault.
- [B510823](/bulletins/10238077.md), 2023-06-26, Service bulletin: VISIBILITY. Upon opening or closing \(i.e., folding in or out\) the exterior mirror assembly, a creaking sound is heard from either the driver and/or passenger side.

JSON: [/v1/bulletins/10218379](/v1/bulletins/10218379)

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