My heater is blowing cold air. I checked the heater hoses running into the cab and they are hot. Why is my heater not working?

 

These are a Pain to fix...... Ether the control head goes bad... Or the Blend Door Servos go bad or get stuck.... Not fun to get to....

Note; It would be safe to say that the Heater Core is not plugged. Just the blend door servos are not moving to divert the hotter air. From your description. that the path I would chase... Keep us posted....