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September 1, 2021 Service bulletin

The air conditioning cycles from cold to warm air while driving or while at a stand still

BMW technical service bulletin B640821 for 2019-2021 BMW X5, 2017-2021 BMW 530I and 2016-2019, 2021 BMW 750LI and others.

Bulletin number
B640821
Component
Electrical system
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 (38F to 60F +) without changing any climate control settings. In some cases the air conditioning may have stopped blowing cold air altogether.

Owners of these vehicles have filed 259 complaints in the electrical category.

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