What does it mean to "Burp" a coolant system? (After replacing coolant)?

and could someone please explain this idea about the over flow tank for radiator? I have a '93 Toyota with a 3.0 liter V-6 engine and just had the water pump , timing belt and coolant replaced two weeks ago. and I don't know should I add more coolant from time to time too? some say yes and other say no,... show more and could someone please explain this idea about the over flow tank for radiator? I have a '93 Toyota with a 3.0 liter V-6 engine and just had the water pump , timing belt and coolant replaced two weeks ago. and I don't know should I add more coolant from time to time too? some say yes and other say no, that you should never have to do anything or add any coolant. is that true? how depends?
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