You could have a blown head gasket, or crack in the head. Has it ever over heated to where it got real hot? If so, I would say the head gasket is the problem. Have it checked at your local repair shop. You can also check the cooling fans behind the Radiator if you're year model has them.Make sure they are coming on after it warms up.I am sure its the gasket. Good Luck, Shastalaker7 ps Let me know what you find, Sincerely, Shastakaker7