What you're describing sure sounds like either a bad blower motor or an error in testing.
Have you tried pulling codes from it?
Diagnostic Trouble Code (DTC) Displaying
The diagnostic trouble codes (DTCs) may be displayed by using either of the following diagnostic tools:
The scan tool
The on-board diagnostics
Perform the following steps in order to display the DTCs using the on-board diagnostic method:
Press one of the following combinations:
For digital IPC, press OFF and WARMER.
For analog IPC, press OFF and PASSENGER WARMER.
Press the LO (fan speed) button until ACM? Appears.
Press the HI (fan speed) button until ACM CODES? Appears.
Press the HI (fan speed) button until ACM DTC appears.
Wednesday, October 22nd, 2014 AT 2:05 AM