okay so tonight my 02 AUDI A4 1.8 Q started to make this noise.
http://www.thehivenetwork.com/audi/Audi02A41.8.m4a
the noise location is coming from the back passenger side of the car. It sounds as though it's some type of pump not really sure.

any ideas? I just got this car about five months ago. already had to put a brand-new A/C compressor and glovebox, engine cover, starter, rotor, back driver-side lumbar support, replaced the back driver seat cover clips and now this. I love the way this car handles and drives, and I love the way I feel in it. But man... I hope this isn't a snowball starting to roll downhill. Please any help you can give me would be much appreciated. I will check this post regularly as a really need to get this fixed.