Originally Posted by TMacsOneGoodEye
Sounds like a broken head gasket. That's not even a big problem as long as you keep putting antifreeze in your radiator. Same thing happened to me a year and a half ago and they wanted to charge me a crap load of money to get it fixed. Then a buddy of mine said as long as I kept the antifreeze/water topped in the radiator it would be fine. I have to fill it up every three weeks or it starts overheating, but it's been fine.
The problem is the coolant getting into the engine, not the other way around. Apparently the engine could have died at any moment.