Service bulletins for the 2011 BMW Z4
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.
133 on file from NHTSA, as of 2026-10-19.
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By component
By trouble code
Only bulletins with component: Heating and air conditioning are shown. Show all
| B650709 | 2018-12-10. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER. 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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| 641010 | 2018-11-13. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER. SI B64 10 10 Heating and Air Conditioning July 2014 Technical Service SUBJECT Howling/Rough Running Noise when the A/C Compressor is Engaged. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.