if its got a 3.8 you probably got a blown head gasket thats where your anti freeze is going . they are / were JUNK motors . had a couple of 'em { the wife } and i'll never own anything ever again with that engine in it even if it is free . the last one kept flashing a couple of codes as it ran fine till it warmed up then went to hades , and overheated . throw it away and get something else . thats my .02 cents worth .