Overflow of what? You could be losing coolant through radiator cap, which could seem like a radiator overflow and problem might be a clog on the hose from rad to expansion tank.
If you are losing coolant due to overflow of expansion tank, any chance you added too much? Always fill to recommended level indicated in dipstick.
With cars it's always worth noting symptoms, how and when they happen. If you're losing coolant for any reason other than adding too much to begin with, it's not a matter of 'if', it's a matter of 'when' the car is going to overheat and cause more problems/cost more, early diagnosis matters.
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