2009 Ford Explorer AC only blows on high
The AC only blows on level 4 (high).
It does blow cold air, so I know it's not related to the refrigerant, etc.
I have replaced the resistor, the blower motor, the relay, checked all related
fuses, and replaced the blower motor selector switch (the knob control).
A faulty resistor seems to be the most likely culprit, but having replaced it
already I can only assume that it is something else that I cannot find or have
thought of, or, that I must have bought the wrong type of resistor.
Any other suggestions before I take it to a mechanic to have him replace a
part that I have already replaced?