2002 Saturn SL2 Coolant Leak

I have a coolant leak with most appearing under the battery platform. I have replaced the radiator and water pump in the last 2000 miles. I have to refill coolant every 2-3 days with leak enough to have to set the light off. I have a small pool after I shut the engine off under the middle of the car. Also, the heat coming out is warm, but the blower intensity is not close to normal. There appears to be on leaks at the heater core site either. There was enough of a leak today to have some white smoke come out from under the hood at the end of my drive this morning (30 degrees outside). Any suggestions would be appreciated.