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Do you mean the blower only blows on the highest setting? If so the blower motor resistor is defective. The blower resistor is located next to the blower motor in the air ducting under the dash of the passengers side of the car.
A heater blower motor resistor is an electronic device with three or more progressive resistors that allow the heater blower motor to operate at slower speeds.
The highest speed of the heater blower motor
is not controlled by the resistor, so when the resistor fails, the fan
will often work on the highest speed setting, but not the lower speeds.
To resistor is generally located under the dashboard and under the hood, near the blower motor .
The resistor's electrical connector is disconnected, the resistor is
removed and the new resistor is installed. On some vehicles it may be
easily accessible, and on others it may take partial dashboard removal
to replace the resistor. Look under the hood, generally the wiring for the Blower resistor is attached to the wiring to the blower motor itself It's inboard & below the motor, near the accumulator. You can see
it standing beside the passenger fender. it's the off-white connector
behind the L heater hose above the vacuum reservoir & the white
Sounds like the blower motor resister is bad, it regulates the speeds of the blower motor, it should be located somewear around the blower motor, 2 screws hold it in the heater box and it has a electrical plug to it.
The resistors are in circuit only on the lower fan speed settings.
On the highest speed setting, power is switched directly to the fan motor.
Check fan power supply fuses,
Check power is available to the fan when high speed selected.
If all above OK, apply power directly to the motor to verify fan motor runs- if it doesn't the motor may need replacement/repair.