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    Heater Making buzzing Sound Audi A4 Black Edition 3.0 TDI V6 Quattro

    I have a 2014 Audi A4 3.0 TDI V6 Black Edition Quattro The buzzing noise only happens after you have been driving for 2 minutes. It only happens when the engine is on. It only happens when its above 19 degrees when temperature is on low the sound fades off I think it stops when the stop start...