They can test the coolant for the presence of combustion gases-which is a sign of h/g failure.
You could have a ttiny hole in the radiator, or simply a poor connection on one of the hoses. Often you find that the coolant only escapes when the coolant is pressurised. Look for telltale signs of white powder (residue from antifreeze) around the radiator fins and hoses. That's often evidence of a leak.
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