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These leaks can be anywhere, and can be near impossible to find with the naked eye. In some cases, they can leak down on top of the underbody protection and sit there, so they never really reach the ground. Other times, they will only leak while the car is in operation, making them nearly impossible to spot.
What you need to do to find a stubborn leak like this is to have the cooling system pressure tested. This will pressurize the system and reveal the location of the leak.
The most common place for leaks is the coolant resevior, but again, the leak could be from any number of hard to spot places.
If the coolant gets too low, the engine can overheat which can in turn cause expensive damage. For this reason, I would suggest you have a pressure test carried out ASAP and replace the leaky part.
I hope that is helpful, please let me know if you have further questions, or if I can clarify anything for you.
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