This sounds like coolant flowing through your heater core, just what you described. A bad u-joint will make a kind of clicking ticking churping pulsing sound. A bad u-joint is usually asociated with a vibration in the drive line.
Check your coolant level and add some if necessary. This sound of water slushing around in your glove box is nothing to worry about as long as you are not loosing or smelling any coolant. If you are, check back we'll go from there. Keep me posted
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Monday, January 21st, 2008 AT 11:48 AM