I have had to watch the level of the coolant every week and this has been going on for about a year and a half, a few months before that I was smelling the antifreeze. Then recently it has been draining in one day. I just replaced the water pump, it was all rusted, helped to slow leak to checking it every couple of days. Then found out that the heater coil needs replaced. Hopefully that will help the heater issue. Last year it worked in the beginning of winter as to slowly defrost the windows. Now it is just blowing out cold air. So, hopefully the replacing heater coil will fix it.