I have a 2006 Chevy Equinox and the blower motor will not blow at all. I replaced the blower motor and it would blow intermittently for a few days then stopped all together so I then replaced the blower motor resistor and I still have nothing. I need help!!!
Have you checked your fuses for a loose connection? On and off performance suggests it's something loose somewhere. Try following the wiring as best you can to see if you can find any shaky parts. If you have a multimeter you can use it to check your fuses continuity and also check if the wiring is providing any power to the motor.