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I have that same sound in my car too. Also, my friend owns a MKIII and he has the same sound in his car as well. We took it to Sound Performance and they said that there is probably air in his coolant. It can happen from time to time and it's not really that big of deal but that is the noise that you are hearing. If there is no air, the coolant just moves as normal; no noise heard. When the air passes by, that is the sound that sounds like rushing water, etc. I don't know about water inside the car and stuff like that but I have never used my AC as I just bought the car a couple of weeks ago and I still hear the sound so I know it's not that.
Anyway, there is a way to "burp" your coolant system. What you do is this:
Park your car on a hill so that the radiator is at the higher point on the hill. Remove the radiator cap when the system has completely cooled down. Turn on the car with the cap still off and turn the heater on full blast. Let the car idol until all of the bubbles have escaped out of the radiator; roughly 15-20 minutes. Put the cap back on and you are good to go.
Make sure that you don't let the coolant get too hot so that it bubbles out but that is the way to do it. We did it with my buddies MKIII and it worked great. I haven't done it to my Spec V yet but that's because I just haven't had the time. Hope that helps!
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