it is probably in the blower motor, at least that is where it is on the 1995 truck. take out glove blox/ remove black metal cover behind glove box. It is the white connector in plain site..
Bad resistor or a malfunction in the switch.
First locate the resistor, it is under the hood, on the firewall, passenger side, close to the blower motor. Unplug the wire connection and remove the three small screws holding it in place, then remove the resistor.
In the truck!
First locate the resistor, it should be under the hood, on the firewall, passenger side, near the blower motor. Unplug the electrical connection, remove the small screws holding it in place then wiggle the resistor out.
Should be near or attached to the blower motor
no such switch.
The 2005 Ford F1 50 pickup truck blower motor resistor pack can be found on the firewall in the engine compartment. The blower motor resistor pack is on the passenger side of the firewall.
Under the hood, passenger side firewall, not far from the blower motor.
Most likely a failed blower resistor.
under the left front tire
Blower motor resistor assembly is located under dash board on passenger side.
blower motor resistor is bad