Question on getting rid of air locks in coolant

The answer as to whether you have an air lock depends on two primary things:

How much coolant was lost.

Whether your engine/chassis has a bleed line from the thermostat housing.

If there is any line from the thermostat housing that you can loosen and verify that there is coolant there, the risk of damage goes away (or if there is one from housing to overflow in which case it is "self-bleeding").