it needs a blower motor resistor to make the fan settings work.If you replace the Blower MOTOR Resistor it should resolve the problem.
Probably the blower motor speed resistor is partially burned out.
check the blower motor resistor
i had a 03 Chevrolet Colorado, and the resitor was located under the glove compartment, where the motor blower is, the resistor is screwed to the side of the blower. hope this works for you. the resistor is usually located there.
If you are saying the Blower Motor only works on high, then your problem is a defective Blower Motor Resistor Pack. Replace it.
switch, relay or blower motor problem as a guess.
the resistor for the blower motor is busted blower works on high with out it
The Blower Motor Resistor Pack is defective. Replace it.
If you mean the fan works on high only it's the blower motor resistor.
replace the blower motor switch
The blower motor works on only one speed. The blower motor resitor pack is defective and needs to be replaced. It is located on the blower housing in the engine compartment just below the blower motor.
bad blower motor
If you are saying that the blower motor only works on the high speed setting, then the Blower Motor Resistor is defective and needs replacing.