BMW 335I 2012–2015 — technical service bulletin
Bulletin 640114 · NHTSA communication 10147979 · issued Feb 1, 2014
Technical service bulletin
communication type
Equipment
component
2012–2015
model years
11
vehicle entries
Official summary
Noise from Heating and Air Conditioner. There is an intermittent whirring noise from the IHKA system when the engine is under load between 2,000 and 3,000 rpm, and sometimes at approximately 5,000 rpm. CAUSE Vibrations from the A/C low-pressure hose are resonating into the heating and air conditioning system.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.