2002 Camry Liquid Noise in the dash

My 2002 Camry, 85,000 miles, makes a liquiding swirling noise, like water running through pipes, when I come to a stop or am turning at low speeds. It sounds like a bucket of water is underneath the dash being poured from side-to-side. No drips found outside the car, when stopped.

I presume this is a coolant issue, but anything else you could tell me before I take it in for repairs? Thanks-cmb