How to solve engine overheat problem/coolent found from floore mat

Engine overheating issue after 4 to 5 days. After check replace heater core. We check engine compartment , radiator , reservour tank but no leakage found. But when we check floore mat coolant found also see heater core.

[@noorhasan4035]

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[@noorhasan4035]

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[@applesanju]

Jogago korar ki kono upai acche dada

[@farhankazi3446]

Call sir ji

[@Dwipsaha]

Dada Apnar phone number/email ta deben please