This is not a simple failure on this model. If you can verify voltage and ground at the motor, yes this would be a problem with the motor itself. There are other components such as the blower motor control module, and the HVAC controller that can also cause for this problem and simple wire tests will not diagnose these items. Here is where the blower motor is located. Here is what you will need to do to access the blower motor. Let me know if you have any questions on testing for this problem! Good luck!
auto, didn't know there was a manual option on escalades.
You enter a temp and press auto, the A/C and heat both turn on and adjust how high it is on based on the temp
Actually I did not either, but they list that in the manual. That may also cover the chevy and gmc models too. I just figured I would ask to be certain. Here is a schematic of the blower motor control. Keep in mind that the blower speed control from the hvac control to the blower motor control module utilizes a voltage signal to control the blower motor. The correct way to verify this requires you to use a scan tool to verify the speed control parameter from the hvac control. Then you simply need to test that wire from the blower motor control processor to the hvac control for high resistance. Feel free to contact me with any further questions! Good luck!