Audi TSB #A191555 2039891-
2015 Audi A4
Affected Component: ENGINE AND ENGINE COOLING:COOLING SYSTEM
- 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.