Basically for the past 2 months I would say whenever I start my car no matter if its really warm out or really cold I hear a little sloshing sound as if water is behind my dash. Then as I am making a turn it becomes louder or if im stopping a little harder then normal it is heard. At first I thought it was water but my common sense tells me that if its -25 degrees celsius and it was water it would freeze. So I am thinking its coolant of some sort but I am lost as to what it could be. i would love some input on what the possiblities might be seeing as tomorow is going to be nice I could fix the problem. My car is a 2003 gp gt. Also I thought it could possibly be the air system but my heat and ac work amazing. Thanks guys.