If the coolant were leaking into the exhaust port the exhaust would be smoking and you would also be able to tell by pulling the spark plugs and looking for an unusually clean plug. The engine would eventually began to mis-fire real bad.
If you recently changed the LOWER intake gaskets--there may be some residual coolant somewhere on the engine that burns off when it gets hot -- and -- the loss of coolant level may stem from not filling the system completely when you changed the gaskets.
Check where the the heater core hose plugs into the right front of the lower intake. Sometimes just a little coolant will leak there.
Double and triple check the oil for coolant. It is easy to over tighten the lower intake gasket causing the gasket to fail prematurely.
If all fails to find the leak, put a bottle of Barsleak Gold, or conventional Barsleak in the radiator. The ingredient in this sealer (ground up ginger root and walnut shells) seals small leaks when it flows into the leak and is exposed to air - outside of the leak. It will not harm the system in any way. It also works on small head gasket leaks.
Tuesday, April 28th, 2009 AT 9:38 PM