Ok I need help.
My heater is blowing cold air and I can't figure out why.
I have a 2001 Ford F150 5.4 Supercrew
Here is the list of all the things that have been done.
1. New heater core
2. New blend door
3. Coolant is full
4. New water pump
5. In line heater hose restrictor removed
6. No Air is in the coolant lines
7. New Thermostat
8. New Blend door actuator

Note I have checked all my heater control ***** and they function as they should

I have not replaced the Blower Motor Resistor and I'm not sure if I would need to or not.

Any ideas why it is still blowing cold?