GMC Troubleshooting Questions? Ask a Mechanic for Answers
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Do you hear the blower fan come on when you change rear fan speed?
Since the fan is working with the controls, next step is to check the aux mode door actuator.
That is for the front blower. The one for the rear ac vents is the one is sent you .
It shows the same part number at gm provided info.
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Hello, just checking if any updates?