Had the same noise with no obvious problems to it,
noticed the noise even before my break-in period...
went to service my car at 1000miles and asked the dealer abt the noise..
they didnt have a clue but i did some research beforehand on VWvortex etc, ppl were saying it was the water pump, so i told them it might be the water pump...
even after inspection they werent sure what it was, but was coming from the right side of the engine bay...
they agreed to replace it, but it had to be ordered from germany...
since performance-wise it was ok and it was going to take em 1 weeks to get the parts in.. i drove home with my car...
funny thing is.......... after a few days, the noise was gone... everything was and is still fine.... some say it might of been an air pocket or watver...
hope all goes well....