There is a coolant leak.
Depending on where you see coolant, the leak can be something as simple as a hose, to a more complex thing like a heater core. There is coolant in the engine, radiator, hoses, and inside the vehicle via the heater core. If a visual inspection cannot pinpoint the leak, a mechanic typically performs a pressure test of the cooling system to help locate the leak. From here, they will be able to take appropriate actions to repair the coolant leak.
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