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There is a blower resister,module ,it is bad,it is located near the blower motor,mounted on the outside of the blower case,but actually goes inside the blower box to keep cool,most of the time the blower motor is the cause for the resister to go out,the blower draws too many amps,even though it may seem it is fine,this is the cause for the resister failure.
Your fan technically only has one speed. The voltage is decreased by the use of a resistor pack to produce the slower fan speeds. If this resistor pack burns out, it will leave you with only the high setting. You can find the resistor pack located under the hood, on the passenger side on top of the fan housing.
Check fuse supplying fan is not blown,
Check blower control switch is operating OK,
Check relay controlling fan is operating OK,
Check variable speed resistor pack is not faulty (the resistor pack is usually located in the blower ducting, in the blower airflow),
Check blower motor ground connection is not missing.