I have a 2002 f150 4 door Lariat. The EATC ( Electronic Automatic Temperature ControlModule) will not control the temperature of the air coming out of the vents.
If you put the unit on automatic and have it set to 60 then it will blow cold air . But when you move it up to 65 then it full hot air.
i have pull the dash and put in a new heater coil and new Blend door and a new Blend door motor. The Blend door is working going from heat to air.
i have run a self diagnostics and no Faults Codes come up. It's either full cold or full hot . any Ideas on what to check.

 

Run the EATC self-test to see if it reports any faults replaced to the blend door actuator.

 

I have run a diagnostic test it come back and no codes.
I have put a new blend door actuator on it.