2010 A4 Quattro 2.0 T... I sometimes hear this very strange "pumping" or kind of ticking/sloshing noise coming from directly behind the dash. Weather or not air or heater is on or off. Also, (stranger) I can sometimes hear it when I'm just sitting in the vehicle with it completely turned off and key removed. Another good way to describe it is it sounds as though the windshield wipers are trying to go off but they aren't as if there was an issue with the wiper motor the I know that's not it. And, for all I know it's not coming from directly behind the dash that's just how it sounds... I don't always here it either just on some days regardless of weather conditions. Anybody else get this?? THANKS!!

 

Are you leaking any fluids?