Since it's not working in level 4, I would assume the resistor is good. (The resistor is a voltage divider and level 4 should bypass the resistors) so you're left with the motor, wiring or switch. Check the fuse, check for power at the plug. The voltage at the plug should change with the switch. If you have voltage at the plug to the blower, the blower is bad.Hello, I own a 08 G5 GT, when I turn the knob for airflow 1-4 it doesn't even blow air at any of them, what do I need to replace or get fixed?