Well we are driving a Mecury Villager...I know it is very domestic!! Well we had it in to our mechanic a couple weeks ago for a look over and oil change etc. They said we had a hose/clamp or heater block(??) leaking. Said it could be $5 dollar part or a $500 part and job. Said they couldnt tell unless they tore into it alittle. The Mrs. is the one who talked to them so it is alittle vague. Well I noticed the last week or so that we are putting out alot more white exhaust. Similiar to what you see when its rainy and cold and the car is warm. It also has seemed to worsen as the week went on. It is white not dark. Could this be related??? Any ideas?? Engine is running fine and the heater is putting out heat. I havent been able to compare and monitor the antifreeze as of yet. This was a new used car we have had for a month or so.