I have a '98 with a 3.8 liter. Have experienced overheating issues, Found several freeze plugs leaking. Replaced freeze plugs, flushed system and everything seemed to be fine. Car did fine for about a week. Started car to go to work and was greeted by a large cloud of steam that smelled of antifreeze. Question: does this sound like a cracked block or a head gasket. Car was not overheated/overheating when I parked it. However the temperature last night was about 10 degrees colder but nowhere near freezing. Anyone have any insight?