Audi A4 Allroad 2015 — technical service bulletin
Bulletin A191555 2039891- · NHTSA communication 10120689 · issued Feb 23, 2015
Technical service bulletin
communication type
Engine and Engine Cooling
component
2015
model years
11
vehicle entries
Official summary
Heating performance is low. Air bubble noises are heard from coolant and/or heat exchanger area. The check valve in the breather line can come loose. As a result, air may get into the coolant system. Modified parts in production starting with production date 2/5/2015.
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.