Had my S3 about 6 months, drove this morning 30 miles on motorway parked up got out, heard the aux pump going as usual and this goes for about 1 min and then shuts down ... about 1 min later heard all that I can describe as a running water sound, bit like washing machine emptying its pipes, went on for about 10 - 20 sec or so ... never heard this noise before any ideas anyone ? I had not had the aircon on by the way.