Added coolant, now sloshing water sound when first turning on

Well you're in Atlanta so it doesn't get very cold you'd be running the air conditioner down there in December sometimes generation 2 so when you look at the coolant storage or the coolant reservoir just behind the radiator is it full along the halfway up line or whatever you see the red coolant in the plastic reservoir? Do you see it still there after the car is warmed up and driven safe from 285 to downtown.? If you were to get out of the car after that drive having good heat everything working you get out you still see the same level of coolant pretty much in the coolant reservoir? If so I wouldn't worry too much about it there are whoo coolant control valves and I imagine if you're hearing the water flowing in the dash you must have the heat on especially this time of year generally speaking You may not have had it on 4 days ago but you do now. But it sounds like you pretty much have nothing to worry about Do you have a check engine light on and any codes? Do you have heat almost leaving your driveway not 108° coming out to vents but you feel it's definitely not what it is outside within a mile In my case that's to the stop sign at the end of the street and I have heat starting to come out of the vents at that point. And that's the way it's always been.