It's most likely the blower motor resistor. It's a pretty common issue with all makes/models of vehicles. Yours is located behind the glove compartment on the top of the blower motor housing (black plastic box poking out from under the dash on the passenger side). Open the glove box and unscrew the liner. Pull the liner out and look on the top of the housing. There should be a square or rectangle piece with a wire pigtail plugged into it. That's the top of the resistor. Unplug the wires, unscrew the screws holding it in and replace it with a new one. The last one I replaced (1995 Chevy K1500 P.U.) was $17.99 at O'Reilly. It's pretty simple, but on some vehicles you just need to be a contortionist to get at the screws holding it in. If I remember correctly, there were 3 self tapping screws with 8mm heads.
Answers & Comments
It's most likely the blower motor resistor. It's a pretty common issue with all makes/models of vehicles. Yours is located behind the glove compartment on the top of the blower motor housing (black plastic box poking out from under the dash on the passenger side). Open the glove box and unscrew the liner. Pull the liner out and look on the top of the housing. There should be a square or rectangle piece with a wire pigtail plugged into it. That's the top of the resistor. Unplug the wires, unscrew the screws holding it in and replace it with a new one. The last one I replaced (1995 Chevy K1500 P.U.) was $17.99 at O'Reilly. It's pretty simple, but on some vehicles you just need to be a contortionist to get at the screws holding it in. If I remember correctly, there were 3 self tapping screws with 8mm heads.
Blower motor resistors are shot or the switch is bad.
In high speed blower motor gets Direct B+, it doesn't go threw the resistors.
Replace the resister in the blower box. common problem