What will cause overflow to bubble and car gets hot?

Either:

1) Thermostat is bad

or

2) Radiator is clogged

or

3) if your losing fluid or hearing a noise, check your water pump.

If your not losing fluid or hearing a noise, the service the radiator by having it flushed. If this doesn't solve your problem, then change the thermostat. If your still having the problem then your radiator may need further service or even replacing.

I'm having the same issue right now. I'm replacing my thermostat next. If it still is running hot, I'm going to take the radiator out and have it serviced.

Good luck! And remember, DONT let the temperature get in the red!!