No need to test the the blower yet. Just do this steps. If numbers 1,2,3and 4 works (meaning you should notice the change of speed of the blower motor from slow speed to faster speed), then the blower motor is fine. Well but u mentioned also that its making noise at times so more than likely, that is the problem. Yeah i think you found the problem already. O yeah, to test the blower motor, if it has 2 wires, its just a bplus and a ground and that should spin.