Ok, drove the car today and it did not overheat! When I got home, i let the car cool down, opened radiator cap and found that coolant was just covering fins of radiator, there was some coolant missing????

Did not add anymore coolant and started the car again with radiator cap off! Found that after the thermostat had opened, coolant level rose and kept rising untill it began to splurt out of the top of the radiator! I almost want to put a clip of it on the website!

Any ideas on what is causing it?????