You didn't mention what engine you have or how many miles on it, if the vehicle was overheated so. It could be a number of things, but in all likelihood it is a blown gasket.(Head, intake, ect)you will have to do the following testing in order to pinpoint the problem. Coolant system pressure test, cylinder compression leak down test, if these two are fine then most likely so is the head gasket. You will have to repeat the test with the oil pan removed to view the inside of the block from below to rule out the block.
Sunday, February 6th, 2011 AT 7:55 PM