SOURCE: The first two blower settings
The problem is blower motor located under dash above passenger feet.Kind of tough to get to but can be done
SOURCE: The heater / ac blower
It is the blower resister. I purchasted one at auto zone for $18.00. It is located under the passenger side dash. You need to remove the glove box and the plastic cover under the dash to expose the blower motor. the blower motor resister is right next to the motor. Simply unplug the resister remove the two screws and replace. I did this and now my fan works on all speeds.
SOURCE: 2004 Ford F150 - AC/Heater blower speed 1 & 2 not working.
You might have a bad speed selector switch, or your blower motor resistor is faulty.
SOURCE: 2000 Dodge RAM no HEAT/ New heater core / AC evap.
There is a actuator on the right side of your leg while sitting in the drivers seat under the dash. It has a plastic rod for actuation manually actuate this diverter and should be the problem.
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