Hi, my name is Dan.
A couple things could that. If the blower is turning slower than normal, it could be caused by the supply voltage being low going to the blower itself. On High speed, the voltage should be about 13 volts at the blower with the engine running. In the past I have had experience with the connecter that goes to the blower resistor melting due to the blower resistor failure. If this connector is melted, then the electrical contacts are likely corroded and creating resistance.
Is the plug melted? If so replace the pigtail connector.
If the blower is turning fast but no air is coming out, I would check the blend doors to see if they operate. I would change the doors to each position and see if they change on the dash. Another possibility is that broken pieces of the motor are not stuck inside one of the blend doors keeping it from moving.
I've attached a couple files for you to look at.
Does this have electronic automatic A/C? Or manual A/C switches?
These are clips of a Ford TSB to help with diagnosing Electronic Automatic Temperature Control.
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Thursday, July 29th, 2021 AT 11:23 AM