Its very possible the motor maybe gone if it was me i would take it out to see if there is leaves are something stuck in the blower itself and i would like to give you this number they sells only GM parts its Schram auto & truck parts # 1800-292-1032
Start the engine put the fan on under dash passager side hit under the dash lots of time vibration of the hit the blower start if it does you have to change the blower that a fast diagnostic check it out pierre
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