Hi I have recently bought a A3 2.0T sline quattro 2006. The car is exceeded all expectations but I was looking for some info from people in the know. When I turn the car off after a run I have a buzzing noise coming from the engine bay I have been told this may be from the auxiliary water pump can anyone clarify if the auxiliary water pump should continue to work after the car is turned off and make the noise it is. Thanks in advance.