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You need to replace blower motor resistor.
Short of it is the resistor controls the fan speeds for the blower. Easy to replace and to my knowledge only available through a dealer.
The resistor is under the passenger dash just left of the blower motor
No such part exists
The blower motor speed resistor is burned out.
should be the connector in the ac housing closest to the blower motor
It is under the dash, behind the glove box.
Your truck has both. the resistor is between the switch & blower.thje resistor controls the blower speed
That's too bad
replace the blower motor switch
either the control head is bad or there is a blower motor resistor that is bad.
it could be a rock or your cars not funny