You just have to see where it is leaking. There are numberous gaskets and hoses it can be coming from. Have it preasurized and it will be easier to find.
If your talking about coolant leaking on the passenger floor then it means your heater core is leaking and needs to be replaced.
Your heater core is leaking. It needs repaired or replaced.
your heater core is leaking. Needs to be replaced
it's leaking coolant. Needs to be replaced.
Means that your heater core is leaking coolant. Has to be replaced.
your heater core is leaking. this is located most the time under the dash. you will have to have it replaced
Coolant leaking from the heater core.
If your heater core is LEAKING engine coolant so that your engine coolant level drops too low or the engine coolant is lost completely and causes your engine to overheat then your engine can be damaged beside the mess the leaking coolant makes inside your vehicle ( you might be able to just temporarily bypass the heater core so that no engine coolant is flowing through the heater core )
A leaking heater core will cause the engine to overheat because the coolant is leaking out.
Your heater core is leaking.
Heater core / hose leaking.
Heating hoses are exposed and need to be replaced. The heater core is leaking coolant.