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If you're overflow has been empty or has not been circulating the coolant back in properly that's where your losing your coolant. You will lose coolant over time if you don't have a proper seal or the hoses are not on tight enough.
What usually ends up happening is when the car reaches temperature the coolant is removed as steam. That steam will evaporate or condense depending on how it leaves the overflow cap. If it's open to the environment via some small hole or improperly secured hoses the fluid will just disperse as steam leaving very little to no trace and result in your magic disappearing coolant.
Might I suggest inspecting your hoses and looking for cracks, holes, and tears?
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