My ford explorer fan is working but heater in intermittent? What can I do to fix it? The air conditioner works fine

My ford explorer fan is working but heater in intermittent? What can I do to fix it? The air conditioner works fine - 1

Take the radiator cap off and see if there's antifreeze in the radiator.

Hi so it needs fixing by the dealer.

There's a heater core which may be clogged with crud. Search YouTube for a video on the proper way to flush it and it will work properly.

Check the Thermostat also…

Del

Check coolant level. Check thermostat and ensure hoses are not kinked or partially collapsed. Otherwise its best slotted it a garage.