I looked over the whole site and could not find any information on this. I drive an 04 f150 and my fan control only works on level 4. 1-3 gets almost no air flow. Does anyone know what the cause of this could be and how to fix it.

 

blower resistor

 

Where is the blower resistor located and where can I get one? This happened in my truck and my wife's expedition.

 

HVAC plenum, passenger side.

 

This helped me