Having a radiator problem?

Basically yesterday I noticed that my coolant Gage in my car was acting funky. I would accelerate and the it steadily get hotter and hotter. So I stop, take a look and notice that there is little to no coolant in my tank. I quickly get some antifreeze and fill up the tank. I start the car, let it sit for a little while and get back on the road. All the while i'm watching my speed and the coolant gage. Yet it still gets hotter and hotter the more I speed up. Top speed was about 65. As far as i've noticed I have no leaks. Can anyone help me?