Friends.

In july I bought a used 2014 BMW F30 320D M packed with 50.000km on the clock.

From the start I noticed a weird sound everytime I turned the a/c on. When the blower door opens a metal sound comes from the engine. And when it closes, the sound seems to dissapear.

I have here a little video so you guys can hear it.



Is this the timming chain failing?

Thank you for the help everyone. I really appreciate!