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You can check the motor first without pulling it. Just disconnect the lead and connect it to 12 volts. Make sure you have a good ground to the fan housing.

Only one speed sounds like the resistor coils are bad. They are located under the hood in the blower housing. Easily accessed and removed. Two screws hold it in the box. Most auto parts stores should have the blower motor. It is a common item that fits many applications.