After replacing the microfilter during a previous service, the customer notices that the ventilation...
BMW technical service bulletin B640321 for 2018-2021 BMW X3, 2019-2021 BMW Z4 and 2019-2021 BMW 330I and others.
- Bulletin number
- B640321
- Component
- Visibility: defroster/defogger/HVAC system
- Summary
- After replacing the microfilter during a previous service, the customer notices that the ventilation system airflow rate is noticeably less.
Owners of these vehicles have filed 20 complaints in the visibility category.
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