Weird noise from engine bay

[Bence]

Hey Guys.

I bought an A3 2008 1.8 TFSI in june. Car was running fine until a few months. I start to hear weird noises like pulsating or something from the front. The sound only occurs when the engine warmed up. It can be heard when idle or in gear. If I push little gas the noise starts coming faster. We tought it can be the drive belt / tensioner pulley. After it was changed for a new on, but the noise/sound came back again. It can be maybe the timing chain ? I dont really have idea now. Check out the video down below.