What if your car is overheating even after you already filled up the radiator and resovior and what does it mean when your defrost wont work when the car is hot does that sound like a blown head gaske?

What if your car is overheating even after you already filled up the radiator and resovior and what does it mean when your defrost wont work when the car is hot does that sound like a blown head gaske?
It does not sound like a head gasket to me. I would check the oil if you see clear bubbles or it is foamy, in my experience that would be a blown head gasket.Is the floor on the passenger side wet=heater core is bad. Are you losing water? Where? Did you replace the thermostat? Hope this helped.