Car is leaking coolant, but why? I have new water pump, temp sensor,thermostat

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Car is leaking coolant.Parked in a dry spot you will notice the leak is in the center, on the ground. I've recently replaced: Water Pump, Thermostat, Temp sensor and a relay switch for fans. What else could be the reason for my coolant leaking out ?I had to add a brand new bottle of antifreeze in radiator. Also I have been burning A/C more then usual