blowing but no heat

Have a 2011 Fusion. Blower is working but no heat. Dialed heat up but only cool air. Blower seems to be working ok. Worked good in summer with cold air but not now. ANy suggestions?

Thermostat stuck open?
Engine temp?
Coolant Level?
Coolant condition?
May have to backflush the heater core.

Am going to check things this aftyernoon.

Sounds like maybe a blend door issue. Sometimes they stick or bind.

CptFantazic 1...if you do buy a new one,make sure it has a bleed valve