Engine is hot, bubbling in heater core

Turn car on for 10 minutes per say, and the engine is extremely hot, and the gauge on dash goes up fast. Nothing is seen leaking underneath, but a lot of smoke is coming out exhaust.
My lights and engine when running are flickering but dont go out, had battery and alternator checked and both passed. After running for awhile, I turn it off and you can hear bubbling from the heater core, and sometimes from the gas tank.