Do you have an overflow bottle on the car? If so, do this...take a clear bottle and run the overflow into the bottle. Start the car and let it get to operating temperature. When the thermostat opens and closes, you will see air bubbles, but they should stop after a cycle or two. If they continue coming out at a regular pace, it indicates you have a bad gasket. If the bubbles stop altogether, the gaskets are good unless you see water in the
oil.