yes air bubbles will overheat the engine because obviously air doesn't cool like liquid. I would bleed it asap. There is an easy way... when the car is COLD, open the radiator cap (the coolant should be at the top already). Start the car and rev the rpms slightly from 2-3k rpms until the engine is at normal operating temp. Turn the A/C on full blast to kick on the fans. Watch the coolant in the radiator. You should see bubbles popping at the surface. Also it is important to turn the heat on full because you want the bubbles out of the heater core as well. Once you don't see air bubbles anymore, shut off the engine and replace the radiator cap after filling it up. Some fluid may or may not overflow during this process. Also check the overflow tank (reserve) if your car has one and make sure it is at the max line.
