Ford F-150 heater core leaking coolant and not providing sufficient heat after recent replacement on Ford F-150

Some Ford F-150 owners report experiencing issues with a leaking heater core, which may manifest as a coolant smell in the cab, foggy windows, and coolant puddles on the floor. Additionally, some owners find that even with adequate coolant, they do not receive sufficient heat, potentially due to a clogged or restricted heater core, which can be exacerbated by twisted or pinched heater core hoses. Others have noted that a worn water pump impeller can lead to inadequate coolant flow through the heater core, affecting the heating system's performance. Furthermore, some owners encounter problems with a malfunctioning thermostat, particularly if it is stuck open, resulting in continuous coolant circulation without adequate heating. To resolve these issues, it is crucial for owners to inspect the heater core, coolant flow, water pump impeller, and thermostat.