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Even when you change the oil, you still get a lot of water sitting in the cavities. The water is heavier than the oil so the coolant sits there until it gets hot then comes out the vent. It will take at least a week of work, to get it out.
If you think you have a coolant leak, Wash off the motor as clean as you can, get the back end of it, Test the Rad cap, then do a bottle test. Do the test on clean concrete, and let it cool in the same space. That way if there is any external leaks you should be able to see them. Just a thought!
Last edited by Johnp3; 10-04-2011 at 08:47 PM.