Ok so I've been noticing this slow grinding noise coming from the passenger side in the engine compartment after I turn my car off and the noise lasts for a lil longer than a minute. The car is an '02 A4 1.8T. Any idea what it is? My mind says its the turbo but I'm unsure.

 

What does the noise sound like?

 

could be the coolent still running through the turbo coming to a stop because the turbo would of stop spinning long time before then