Hi:
The most common problem is the blower motor resister. It's a cheap part. If you want to be sure, check for power to the motor. If there is no power, replace the resister. If there is power, make sure you have a good ground. If you do, the motor may be bad.
Let me know if this helps.
Joe
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Tuesday, April 16th, 2019 AT 2:22 PM