I'm working on an expedition with a Triton 4.6L in it that is only blowing cold air out of the front heater but the middle and the back heaters work. So far I have tried:
-Blower motor tested and working.
-Flushed the entire cooling system
-Flushed the front heater core twice
-Pulled out the dash board and checked the blender door and it's working fine
-While the dash was out I made sure the blower was infact blowing on the heater core.
-Changed thermostat in it
Today or tomorrow I'm going to pull the water pump and make sure that is good to go.

If the water pump is fine, am I missing something. I have done all that I can think of with it. Now does anyone know about the temp of the hoses that exit the heater core and what they about are. Thanks and any help would be great.