Hopefully you're not leakng coolant internally (and it's burning off). Fill it with coolant, park it overnight, and check underneath in the morning.
You can also use a pressure tester. It screws on were the cap goes on the coolant tank. You pump it up to pressurize the system, and any major leaks should become apparent.
With all the coolant you're losing, don't forget to watch out for air trapped in the system.
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