# Service bulletin B640821

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: 10239614
- Published by NHTSA: 2023\-07\-24
- Manufacturer's number: B640821
- Manufacturer's date: 2023\-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.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2023/MC-10239614-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2023/MC-10239614-9999.pdf)

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

## Components

Glass, wipers and mirrors, Heating and air conditioning

## Vehicles listed

- 2018 to 2023 BMW 530E
- 2017 to 2023 BMW 530I
- 2018 to 2019 BMW 540D
- 2020 BMW 540D
- 2017 to 2023 BMW 540I
- 2018 to 2019 BMW 640I
- 2020 BMW 640I
- 2017 to 2019 BMW 740E
- 2017 to 2021 BMW 740I
- 2022 BMW 740I
- 2016 to 2017 BMW 740LI
- 2020 to 2021 BMW 745E
- 2022 BMW 745E
- 2018 to 2019 BMW 750I
- 2016 to 2021 BMW 750LI
- 2022 BMW 750LI
- 2020 to 2022 BMW 840I
- 2021 to 2023 BMW ALPINA XB7
- 2018 to 2021 BMW B7 ALPINA
- 2018 to 2022 BMW M5
- 2017 BMW M550I
- 2018 to 2023 BMW M550I
- 2017 to 2021 BMW M760I
- 2022 BMW M760I
- 2021 BMW M760LI
- 2022 BMW M760LI
- 2020 to 2023 BMW M8
- 2020 BMW M8 GRAN COUPE
- 2019 BMW M850I
- 2020 to 2022 BMW M850I
- 2019 BMW M850XI
- 2019 to 2023 BMW X5
- 2020 to 2022 BMW X6
- 2020 BMW X6 M
- 2019 to 2023 BMW X7

## Recalls for the same vehicles and component

- [23V099000](/recalls/nhtsa/23V099000.md), 2023-02-17: ELECTRICAL SYSTEM:SOFTWARE; VISIBILITY:POWER WINDOW DEVICES AND CONTROLS
- [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

## Other bulletins for the same vehicles and component

- [B630418](/bulletins/11020927.md), 2025-07-28, Service bulletin: VISIBILITY/WIPER. One or more of the LED daytime running lights are dim or discolored.
- [B510224](/bulletins/10252032.md), 2024-04-01, Service bulletin: VISIBILITY:REARVIEW MIRRORS/DEVICES:EXTERIOR; EQUIPMENT. A squeaking sound is heard when folding either of the exterior mirrors assemblies in or out.
- [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.
- [B612823](/bulletins/10245378.md), 2023-12-06, Service bulletin: VISIBILITY:POWER WINDOW DEVICES AND CONTROLS; ELECTRICAL SYSTEM. A thumping sound is heard when the window reaches the closing end stop.
- [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.
- [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/10239614](/v1/bulletins/10239614)

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