hey guys, i know this has problem been resolved before but i am having problems with my a4 b7 with cold starts. it just started a couple of weeks ago. when i start my car @ 6:10 in the morning( eastern time) it sound like something is knocking and the serp belt is sqweaking. the car runs fine and itsnt leaking anything that i know of. it doesnt do it when i start it again when i leave work @ 3:30. can anyone help me!?

 

and it only knocka for about 15 seconds as well.

 

Anybody? Do i need to change my timing belt/water pump or is it something as simply tighting a pully or tensioner?