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

loosing fluid out the overfull, running the heat, works most times, but not always

Asked by for the 2003 Chrysler Sebring
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.