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January 1, 2016 Service bulletin

Whistling Noise Coming from the Center Vent

BMW technical service bulletin B650709 for 2007-2017 BMW X5, 2007-2016 BMW 328I and 2004-2017 BMW X3 and others.

Bulletin number
B650709
Component
Equipment: appliance: air conditioner
Summary
Whistling Noise Coming from the Center Vent - A/C is Off . A very high pitched whistling or beeping noise is heard coming from the center vents. The flow of refrigerant through the expansion valve at certain temperature differentials.

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