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Q:

coolant leaking inside floor of driverside. on 2002 Buick Century

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
coolant level keeps getting low, keep putting coolant but I notice coolant on inside floor on driver's side.
(2) Answers
check for leak at heater hose connections, near the firewall. Also check to see if the coolent is coming from the heater case. If so you probably have a leak in the heater core.
You can also turn on the defroster if you get a sweet smelling mist on the windshield, then
it is most likely you have a heater core leak and you would need to replace it.