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Q:

Car is overheating, new thermostat, new water pump, plenty of fluid, fan running on 2003 Chrysler Sebring

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
loosing fluid out the overfull, running the heat, works most times, but not always
(1) Answer
heater core is going bad most likely loosing water into your floor board from inside the dash. Simple fix you lose your heat but can use a waterhose, other wise remove dash and change core.