2023-2024 BMW 5/7 Series AC Vent Issue SIB 64 04 24

Owners of 2023-2024 BMW 5 Series (G60, i5 Sedan, 530i) and 7 Series (G70, i7 Sedan, 740i) vehicles may notice an issue with their climate control system, specifically an "unfavorable heat and AC when the dashboard vents are closed". This condition, detailed in BMW Service Information Bulletin SIB 64 04 24, can result in cold air blowing from certain vents even when the driver intends to close them or direct airflow elsewhere. This BMW AC vent issue affects both PHEV and ICE vehicles produced up to July 2024.

Symptoms

Drivers may observe the following specific conditions related to the BMW AC vent issue:

• If the center air vent on the left side is closed, all other air vents on the left side will only blow cold air into the passenger area.
• If both center air vents are closed, all other air vents will only blow cold air into the passenger area.
• If the center air vent on the right side is closed, all other air vents on the right side will only blow cold air into the passenger area.

Cause

The root cause of this climate control anomaly is a false signal originating from the temperature sensor within the center air vents. When these vents are closed using the airflow touch controls, the warm air builds up at the temperature sensor. This false reading prompts the air conditioning system to overcompensate by attempting to cool the passenger area rapidly. As a result, the system blows cold air through any other vents that remain open. The air direction control rollers on the dashboard do not influence this particular situation.

Important Warnings

BMW explicitly states that a parts replacement does not provide a remedy and is therefore not permitted for this specific issue. This means owners should not be upsold on new vent components or climate control parts to address this problem, as it is software-related.

Repair Procedure Summary

Addressing the BMW AC vent issue involves a software update. Technicians will first determine the vehicle's current integration level (I-level) using BMW's diagnostic tools like AIR or the Key Reader/AWP applications. If the current I-level is lower than G070-24-07-500, the vehicle requires programming using the ISTA diagnostic system.

The programming procedure requires ISTA 4.48.1 or a higher version, which was scheduled for release in July 2024. During the programming, ISTA will automatically reprogram and code all programmable control modules to ensure they have the latest software. It is crucial to connect a BMW-approved battery charger/power supply, as referenced in SI B04 23 10, to maintain stable voltage throughout the process.

If the vehicle's I-level is already at G070-24-07-500 or higher, further diagnosis with ISTA is necessary to investigate other potential causes for the climate control behavior.

Required Tools or Parts

The primary tool required for this repair is the BMW ISTA diagnostic system, specifically version ISTA 4.48.1 or newer. Additionally, a BMW-approved battery charger/power supply (refer to SI B04 23 10) is essential to ensure stable power during the software update process.

Owner Action

If you own a 2023-2024 BMW 5 Series or 7 Series and are experiencing the described BMW AC vent issue, you should contact your authorized BMW dealer. Explain the symptoms you are observing, referencing Service Information Bulletin SIB 64 04 24. The dealer will be able to check your vehicle's software integration level and perform the necessary programming update. Until the software update can be performed, a temporary workaround is to open all the center air vents; the air conditioning system should then regulate correctly.

Source: NHTSA ID: 10252041