it has too b.c i see some coolant stains around the area where the resovior cap is located. and its always over filling when i see it empty 30 mins ago. it has to go somewhere besides burning in cumbustion camber. but it could be
the coolant is not overflowing. the coolant is being burnt. the headgasket seals the head and the block together. it was lifted for some odd reason, and now the coolant that circulates through the engine is spliiting in to the combustion chamber. which gets burned as it cycles. it will continue to burn coolant, sweet smelling smoke coming out your exhaust, and the only way to stop it is to replace the headgasket with a new one.
hope that helps. good luck.