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I would check that the radiator drain is fully sealed. It might be leaking and running down the belly pan, then draining near the tire. I've had some leak after draining as some particulate gets stuck in the drain at closing. Usually, I open and close it again and it's good.
Did someone put a hole in the bottom of the car with a jack? It looks like a hole in the 1st picture.
 
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If the system is not full due to a leak, you can hear coolant in the heater core slosh around. The larger hole on the right of the picture is what I was wondering about. It's big enough to allow water to enter the bottom of the car.
 
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