A/C blower motor not working?

2012 GMC TERRAIN
162,150 MILES • 2.4L • 6 CYL • 2WD • AUTOMATIC
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CMCCRORY
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A/C and heater aren't working when i turn it on but as long as it is on and circulating from the outside and I'm driving i have a small amount of airflow. when i stop i have nothing. Before it started this i was experiencing a knocking like sound when i would turn it on, and the pressure of air coming out of the vents would fluctuate even when it was on high.
Oct 6, 2022 at 8:34 AM
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STRAILER
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This sounds like the blower motor needs to be replaced. here is the location of the blower motor and a generic guide to help you test for power and check the ground. Check the images below.

https://www.2carpros.com/articles/blower-fan-motor-works-on-high-speed-only

Check out the images (below). Please let us know what happens.

Oct 6, 2022 at 12:05 PM