Airbubbles in radiator, normal or should I worry?

[mustangII460]

You didn't post what year car or motor etc.

Low in the recovery tank? Or just in the Radiator? Some coolant will get pushed out/burned off. A few bubbles are normal. How much, and how often do you add?

You can have someone raise the RPM's a tad when the thermostat opens, (Coolant moving) then add coolant. This will help bleed out air. Without a recovery tank though, it probably will push the added fluid out onto the ground.

There are other tricks like filling up radiator with your car on a hill, drilling small holes in thermostat. Make sure the car is hot when you add to it, the heater needs to be flowing also.